Add UPDATING entries and bump version

Approved by: so
contrib/tzdata: import tzdata 2022b and 2022c
2026-10-28 11:25:21 +01:00 · 2022-08-30 19:08:32 -04:00 · 2022-08-30 19:01:22 -04:00 · 2022-08-30 18:57:49 -04:00 · 2022-08-09 16:00:03 -04:00 · 2022-08-09 16:00:03 -04:00
1641 changed files with 20084 additions and 61334 deletions
@@ -1,11 +1,14 @@
 # $FreeBSD$

-freebsd_instance:
-  # image: freebsd-12-1-stable-amd64
-  # We need a newer image to install llvm11
-  image_family: freebsd-12-1-snap
+compute_engine_instance:
+  # Image list available via
+  # gcloud compute images list --project freebsd-org-cloud-dev --no-standard-images
+  platform: freebsd
+  image_project: freebsd-org-cloud-dev
+  image: freebsd-13-0-release-amd64
  cpu: 8
  memory: 24G
+  disk: 40

 env:
  CIRRUS_CLONE_DEPTH: 1
@@ -14,7 +17,7 @@ task:
  only_if: $CIRRUS_BRANCH != 'svn_head'
  timeout_in: 120m
  install_script:
-  - pkg install -y qemu42 uefi-edk2-qemu-x86_64 llvm11
+  - pkg install -y qemu uefi-edk2-qemu-x86_64 llvm11
  setup_user_script:
  - pw useradd user
  - mkdir -p /usr/obj/$(pwd -P)
@@ -25,3 +28,6 @@ task:
  - su user -c "make CROSS_TOOLCHAIN=llvm11 WITHOUT_TOOLCHAIN=yes PKG_FORMAT=tar packages"
  test_script:
  - sh tools/boot/ci-qemu-test.sh
+  post_script:
+  - df -m
+  - du -m -s /usr/obj
@@ -0,0 +1,27 @@
+*.a
+*.core
+*.o
+*.so
+*.swp
+*~
+_.tinderbox.*
+_.universe-toolchain
+_.amd64.*
+_.arm.*
+_.arm64.*
+_.i386.*
+_.ia64.*
+_.mips.*
+_.pc98.*
+_.powerpc.*
+_.riscv.*
+_.sparc64.*
+_.sun4v.*
+GPATH
+GRTAGS
+GTAGS
+ID
+cscope.files
+cscope.in.out
+cscope.out
+cscope.po.out
@@ -2299,7 +2299,8 @@ _bootstrap_tools_links+=crunchgen
 # Note: kbdcontrol can not be bootstrapped on non-FreeBSD systems
 .if !defined(CROSSBUILD_HOST)
 .if (${BOOTSTRAPPING} < 1003501 || \
-	(${BOOTSTRAPPING} >= 1100000 && ${BOOTSTRAPPING} < 1100103))
+	(${BOOTSTRAPPING} >= 1100000 && ${BOOTSTRAPPING} < 1100103) || \
+	(!exists(/usr/sbin/kbdcontrol)))
 _kbdcontrol=	usr.sbin/kbdcontrol
 .else
 _bootstrap_tools_links+=kbdcontrol
@@ -36,6 +36,17 @@
 #   xargs -n1 | sort | uniq -d;
 # done

+# 20210204: bump shared libraries which link against ncurses
+OLD_LIBS+=lib/libedit.so.7
+OLD_LIBS+=usr/lib/libdialog.so.8
+OLD_LIBS+=usr/lib/libdpv.so.1
+OLD_LIBS+=usr/lib/libform.so.5
+OLD_LIBS+=usr/lib/libformw.so.5
+OLD_LIBS+=usr/lib/libmenu.so.5
+OLD_LIBS+=usr/lib/libmenuw.so.5
+OLD_LIBS+=usr/lib/libpanel.so.5
+OLD_LIBS+=usr/lib/libpanelw.so.5
+
 # 20210116: if_wl_wavelan.h removed
 .if ${TARGET_ARCH} == "i386"
 OLD_FILES+=usr/include/machine/if_wl_wavelan.h
@@ -1201,11 +1212,19 @@ OLD_DIRS+=usr/lib/clang/10.0.0/lib/freebsd
 OLD_DIRS+=usr/lib/clang/10.0.0/lib
 OLD_DIRS+=usr/lib/clang/10.0.0

+# 20200520: xform_userland.h removed
+OLD_FILES+=usr/include/crypto/xform_userland.h
+
 # 20200515: libalias cuseeme protocol support retired
 OLD_LIBS+=lib/libalias_cuseeme.so
 OLD_FILES+=usr/lib/libalias_cuseeme.a
 OLD_FILES+=usr/lib/libalias_cuseeme_p.a

+# 20200511: Remove deprecated crypto algorithms
+OLD_FILES+=usr/include/crypto/cast.h
+OLD_FILES+=usr/include/crypto/castsb.h
+OLD_FILES+=usr/include/crypto/skipjack.h
+
 # 20200511: Remove ubsec(4)
 OLD_FILES+=usr/share/man/man4/ubsec.4.gz

@@ -1241,6 +1260,7 @@ OLD_FILES+=usr/share/man/man1/gdbserver.1.gz
 OLD_FILES+=usr/share/man/man1/kgdb.1.gz

 # 20200327: OCF refactoring
+OLD_FILES+=usr/include/crypto/cryptosoft.h
 OLD_FILES+=usr/share/man/man9/crypto_find_driver.9.gz
 OLD_FILES+=usr/share/man/man9/crypto_register.9.gz
 OLD_FILES+=usr/share/man/man9/crypto_unregister.9.gz
@@ -2590,8 +2610,9 @@ OLD_FILES+=usr/bin/mklocale
 OLD_FILES+=usr/share/man/man1/mklocale.1.gz
 OLD_FILES+=usr/bin/colldef
 OLD_FILES+=usr/share/man/man1/colldef.1.gz
-# 20190904: Remove boot1.efifat
+# 20190904: Remove boot1.efifat and gptboot.efifat (which never should have been)
 OLD_FILES+=boot/boot1.efifat
+OLD_FILES+=boot/gptboot.efifat
 # 20190903: pc-sysinstall(8) removed
 OLD_FILES+=usr/share/examples/pc-sysinstall/README
 OLD_FILES+=usr/share/examples/pc-sysinstall/pc-autoinstall.conf
@@ -8558,8 +8579,6 @@ OLD_FILES+=etc/rc.firewall6
 OLD_FILES+=usr/share/examples/etc/rc.firewall6
 # 20091117: removal of rc.early(8) link
 OLD_FILES+=usr/share/man/man8/rc.early.8.gz
-# 20091117: usr/share/zoneinfo/GMT link removed
-OLD_FILES+=usr/share/zoneinfo/GMT
 # 20091027: pselect.3 implemented as syscall
 OLD_FILES+=usr/share/man/man3/pselect.3.gz
 # 20091005: fusword.9 and susword.9 removed
@@ -0,0 +1,82 @@
+FreeBSD Source:
+---------------
+This is the top level of the FreeBSD source directory.  This file
+was last revised on:
+$FreeBSD$
+
+FreeBSD is an operating system used to power modern servers,
+desktops, and embedded platforms. A large community has
+continually developed it for more than thirty years. Its
+advanced networking, security, and storage features have
+made FreeBSD the platform of choice for many of the
+busiest web sites and most pervasive embedded networking
+and storage devices.
+
+For copyright information, please see the file COPYRIGHT in this
+directory. Additional copyright information also exists for some
+sources in this tree - please see the specific source directories for
+more information.
+
+The Makefile in this directory supports a number of targets for
+building components (or all) of the FreeBSD source tree.  See build(7), config(8),
+https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html, and
+https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html
+for more information, including setting make(1) variables.
+
+Source Roadmap:
+---------------
+```
+bin		System/user commands.
+
+cddl		Various commands and libraries under the Common Development
+		and Distribution License.
+
+contrib		Packages contributed by 3rd parties.
+
+crypto		Cryptography stuff (see crypto/README).
+
+etc		Template files for /etc.
+
+gnu		Various commands and libraries under the GNU Public License.
+		Please see gnu/COPYING* for more information.
+
+include		System include files.
+
+kerberos5	Kerberos5 (Heimdal) package.
+
+lib		System libraries.
+
+libexec		System daemons.
+
+release		Release building Makefile & associated tools.
+
+rescue		Build system for statically linked /rescue utilities.
+
+sbin		System commands.
+
+secure		Cryptographic libraries and commands.
+
+share		Shared resources.
+
+stand		Boot loader sources.
+
+sys		Kernel sources.
+
+sys/<arch>/conf Kernel configuration files. GENERIC is the configuration
+		used in release builds. NOTES contains documentation of
+		all possible entries.
+
+tests		Regression tests which can be run by Kyua.  See tests/README
+		for additional information.
+
+tools		Utilities for regression testing and miscellaneous tasks.
+
+usr.bin		User commands.
+
+usr.sbin	System administration commands.
+```
+
+For information on synchronizing your source tree with one or more of
+the FreeBSD Project's development branches, please see:
+
+  https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/current-stable.html
@@ -11,6 +11,212 @@ handbook:
 Items affecting the ports and packages system can be found in
 /usr/ports/UPDATING.  Please read that file before running portupgrade.

+20220830:
+	13.0-RELEASE-p13 FreeBSD-SA-22:13.zlib
+			 FreeBSD-EN-22:20.tzdata
+
+	zlib heap buffer overflow [SA-22:13.zlib]
+
+	Timezone database information update [EN-22:20.tzdata]
+
+20220726:
+	13.0-RELEASE-p12 FreeBSD-SA-22:09.elf
+			 FreeBSD-SA-22:10.aio
+			 FreeBSD-SA-22:11.vm
+			 FreeBSD-SA-22:12.lib9p
+			 FreeBSD-EN-22:17.cam
+			 FreeBSD-EN-22:19.pam_exec
+
+	Out of bounds read in elf_note_prpsinfo() [SA-22:09.elf]
+
+	AIO credential reference count leak [SA-22:10.aio]
+
+	Memory disclosure by stale virtual memory mapping [SA-22:11.vm]
+
+	Missing bounds check in 9p message handling [SA-22:12.lib9p]
+
+	Kernel memory corruption during SCSI error recovery [EN-22:17.cam]
+
+	NULL pointer dereference in pam_exec(8) [EN-22:19.pam_exec]
+
+20220405:
+	13.0-RELEASE-p11 FreeBSD-EN-22:15.pf
+			 FreeBSD-SA-22:04.netmap
+			 FreeBSD-SA-22:05.bhyve
+			 FreeBSD-SA-22:06.ioctl
+			 FreeBSD-SA-22:07.wifi_meshid
+			 FreeBSD-SA-22:08.zlib
+
+	pf(4) tables may fail to load [EN-22:15.pf]
+
+	Potential jail escape vulnerabilities in netmap [SA-22:04.netmap]
+
+	Bhyve e82545 device emulation out-of-bounds write [SA-22:05.bhyve]
+
+	mpr/mps/mpt driver ioctl heap out-of-bounds write [SA-22:06.ioctl]
+
+	802.11 heap buffer overflow [SA-22:07.wifi_meshid]
+
+	zlib compression out-of-bounds write [SA-22:08.zlib]
+
+20220322:
+	13.0-RELEASE-p10 FreeBSD-EN-22:14.tzdata
+
+	Timezone database information update. [EN-22:14.tzdata]
+
+20220321:
+	13.0-RELEASE-p9 FreeBSD-EN-22:13.zfs
+
+	Fix ZFS data loss [FreeBSD-EN-22:13.zfs]
+
+20220315:
+	13.0-RELEASE-p8	FreeBSD-EN-22:10.zfs
+			FreeBSD-EN-22:11.zfs
+			FreeBSD-EN-22:12.zfs
+			FreeBSD-SA-22:02.wifi
+			FreeBSD-SA-22:03.openssl
+
+	ZFS writes fail to update file size [FreeBSD-EN-22:10.zfs]
+
+	ZFS lseek(2) inconsistencies [FreeBSD-EN-22:11.zfs]
+
+	ZFS panic upon concurrent 'zfs list' calls [FreeBSD-EN-22:12.zfs]
+
+	Multiple WiFi issues [FreeBSD-SA-22:02.wifi]
+
+	OpenSSL certificate parsing infinite loop [FreeBSD-SA-22:03.openssl]
+
+20220201:
+	13.0-RELEASE-p7 FreeBSD-EN-22:07.la57
+
+	Fix Intel CPU LA57 boot failure [EN-22:07.la57]
+
+20220111:
+	13.0-RELEASE-p6	FreeBSD-EN-22:01.fsck_ffs
+			FreeBSD-EN-22:02.xsave
+			FreeBSD-EN-22:03.hyperv
+			FreeBSD-EN-22:05.tail
+			FreeBSD-EN-22:06.libalias
+			FreeBSD-SA-22:01.vt
+
+	Fix fsck_ffs bad inode number errors [EN-22:01.fsck_ffs]
+
+	Correct size of the amd64 SSE area in the xsave layout [FreeBSD-EN-22:02.xsave]
+
+	Prepopulate Hyper-V PCI device bars [FreeBSD-EN-22:03.hyperv]
+
+	Fix "tail -F" file rotation detection [FreeBSD-EN-22:05.tail]
+
+	Fix fragmented UDP packets handling [FreeBSD-EN-22:06.libalias]
+
+	Fix vt console buffer overflow [FreeBSD-SA-22:01.vt]
+
+20211103:
+	13.0-RELEASE-p5	FreeBSD-EN-21:26.libevent
+			FreeBSD-EN-21:27.caroot
+			FreeBSD-EN-21:28.vmci
+			FreeBSD-EN-21:29.tzdata
+
+	Fix libevent1 ABI breakage. [EN-21:26.libevent]
+
+	Root certificate bundle update. [EN-21:27.caroot]
+
+	Fix kernel panic in vmci driver initialization. [EN-21:28.vmci]
+
+	Timezone database information update. [EN-21:29.tzdata]
+	
+20210824:
+	13.0-RELEASE-p4	FreeBSD-EN-21:23.virtio_blk
+			FreeBSD-EN-21:24.libcrypto
+			FreeBSD-EN-21:25.bhyve
+			FreeBSD-SA-21:13.bhyve
+			FreeBSD-SA-21:14.ggatec
+			FreeBSD-SA-21:15.libfetch
+			FreeBSD-SA-21:16.openssl
+
+	Fix virtio_blk(4) failing to attach on some hypervisors. [EN-21:23.virtio_blk]
+
+	Fix OpenSSL 1.1.1e API functions not being exported. [EN-21:24.libcrypto]
+
+	Fix NVMe iovec construction for large IOs. [EN-21:25.bhyve]
+
+	Fix missing error handling in bhyve(8) device models. [SA-21:13.bhyve]
+
+	Fix remote code execution in ggatec(8). [SA-21:14.ggatec]
+
+	Fix libfetch out of bounds read. [SA-21:15.libfetch]
+
+	Fix multiple OpenSSL vulnerabilities. [SA-21:16.openssl]
+
+20210629:
+	13.0-RELEASE-p3	FreeBSD-EN-21:18.libc++
+			FreeBSD-EN-21:19.libcasper
+			FreeBSD-EN-21:20.vlan
+			FreeBSD-EN-21:21.ipfw
+			FreeBSD-EN-21:22.linux_futex
+
+	Missing C++20 headers in libc++ [EN-21:18.libc++]
+
+	libcasper assertion failure [EN-21:19.libcasper]
+
+	Missing backwards compatibility in vlan(4) [EN-21:20.vlan]
+
+	Kernel panic with ipfw link-layer filtering enabled [EN-21:21.ipfw]
+
+	Linux compatibility layer futex(2) system call vulnerability [EN-21:22.linux_futex]
+
+20210601:
+	13.0-RELEASE-p2 FreeBSD-EN-21:17.libradius
+
+	Incorrect validation in rad_get_attr(3) [FreeBSD-EN-21:17.libradius]
+
+20210526:
+	13.0-RELEASE-p1	FreeBSD-EN-21:12.divert
+			FreeBSD-EN-21:13.mpt
+			FreeBSD-EN-21:14.pms
+			FreeBSD-EN-21:15.virtio
+			FreeBSD-EN-21:16.bc
+			FreeBSD-SA-21:11.smap
+			FreeBSD-SA-21:12.libradius
+
+	Kernel double free when transmitting on a divert socket [FreeBSD-EN-21:12.divert]
+
+	mpt(4) I/O errors with a large maxphys value [FreeBSD-EN-21:13.mpt]
+
+	pms(4) data corruption [FreeBSD-EN-21:14.pms]
+
+	virtio(4) device probing fails [FreeBSD-EN-21:15.virtio]
+
+	dc update [FreeBSD-EN-21:16.bc]
+
+	SMAP bypass [FreeBSD-SA-21:11.smap]
+
+	Missing message validation in libradius(3) [FreeBSD-SA-21:12.libradius]
+
+20210413:
+	13.0-RELEASE.
+
+20210406:
+	13.0-RC5-p1	FreeBSD-SA-21:08.vm
+			FreeBSD-SA-21:10.jail_mount
+
+	Memory disclosure by stale virtual memory mapping [SA-21:08.vm]
+
+	Jail escape possible by mounting over jail root [SA-21:10.jail_mount]
+
+20210325:
+	13.0-RC3-p1	FreeBSD-SA-21:07.openssl
+
+	Fix multiple OpenSSL issues [SA-21:07.openssl]
+
+20210223:
+	13.0-BETA3-p1	FreeBSD-SA-21:03.pam_login_access
+			FreeBSD-SA-21:06.xen
+
+	login.access fails to apply rules [SA-21:03.pam_login_access]
+
+	Xen grant mapping error handling issues [SA-21:06.xen]
+
 20210202:
 	Various LinuxKPI functionality was added which conflicts with DRM.
 	Please update your drm-kmod port to after the __FreeBSD_verison 1300139
@@ -717,7 +717,7 @@ extern dt_pcb_t *yypcb;		/* pointer to current parser control block */
 extern char yyintprefix;	/* int token prefix for macros (+/-) */
 extern char yyintsuffix[4];	/* int token suffix ([uUlL]*) */
 extern int yyintdecimal;	/* int token is decimal (1) or octal/hex (0) */
-extern char yytext[];		/* lex input buffer */
+extern char *yytext;		/* lex input buffer */
 extern int yylineno;		/* lex line number */
 extern int yydebug;		/* lex debugging */
 extern dt_node_t *yypragma;	/* lex token list for control lines */
@@ -129,8 +129,6 @@ SRCS+=		dis_tables.c
 DSRCS+=		regs_x86.d
 .endif

-LFLAGS+=-l
-
 YFLAGS+=-d

 LIBADD=	ctf elf proc pthread rtld_db
@@ -161,6 +161,7 @@ KERNEL_C = \
 	zfs_debug.c \
 	zfs_fm.c \
 	zfs_fuid.c \
+	zfs_racct.c \
 	zfs_sa.c \
 	zfs_znode.c \
 	zfs_ratelimit.c \
@@ -29,7 +29,7 @@
 #
 .POSIX:

-VERSION = 3.2.6
+VERSION = 3.3.3

 SRC = %%SRC%%
 OBJ = %%OBJ%%
@@ -1,5 +1,51 @@
 # News

+## 3.3.3
+
+This is a production release with one tweak and fixes for manuals.
+
+The tweak is that `length(0)` returns `1` instead of `0`. In `3.3.1`, I changed
+it so `length(0.x)`, where `x` could be any number of digits, returned the
+`scale`, but `length(0)` still returned `0` because I believe that `0` has `0`
+significant digits.
+
+After request of FreeBSD and considering the arguments of a mathematician,
+compatibility with other `bc`'s, and the expectations of users, I decided to
+make the change.
+
+The fixes for manuals fixed a bug where `--` was rendered as `-`.
+
+## 3.3.2
+
+This is a production release that fixes a divide-by-zero bug in `root()` in the
+[extended math library][16]. All previous versions with `root()` have the bug.
+
+## 3.3.1
+
+This is a production release that fixes a bug.
+
+The bug was in the reporting of number length when the value was 0.
+
+## 3.3.0
+
+This is a production release that changes one behavior and fixes documentation
+bugs.
+
+The changed behavior is the treatment of `-e` and `-f` when given through
+`BC_ENV_ARGS` or `DC_ENV_ARGS`. Now `bc` and `dc` do not exit when those options
+(or their equivalents) are given through those environment variables. However,
+`bc` and `dc` still exit when they or their equivalents are given on the
+command-line.
+
+## 3.2.7
+
+This is a production release that removes a small non-portable shell operation
+in `configure.sh`. This problem was only noticed on OpenBSD, not FreeBSD or
+Linux.
+
+Non-OpenBSD users do ***NOT*** need to upgrade, although NetBSD users may also
+need to upgrade.
+
 ## 3.2.6

 This is a production release that fixes the build on FreeBSD.
@@ -342,7 +342,7 @@ Folders:
 [20]: https://git.yzena.com/gavin/bc
 [21]: https://gavinhoward.com/2020/04/i-am-moving-away-from-github/
 [22]: https://www.deepl.com/translator
-[23]: https://svnweb.freebsd.org/base/head/contrib/bc/
+[23]: https://cgit.freebsd.org/src/tree/contrib/bc
 [24]: https://bugs.freebsd.org/
 [25]: https://reviews.freebsd.org/
 [26]: ./manuals/bcl.3.md
@@ -253,7 +253,7 @@ replace_ext() {
 	_replace_ext_ext1="$2"
 	_replace_ext_ext2="$3"

-	_replace_ext_result=${_replace_ext_file%.$_replace_ext_ext1}.$_replace_ext_ext2
+	_replace_ext_result="${_replace_ext_file%.$_replace_ext_ext1}.$_replace_ext_ext2"

 	printf '%s\n' "$_replace_ext_result"
 }
@@ -1199,17 +1199,12 @@ SRC_TARGETS=""

 src_files=$(find_src_files $unneeded)

-temp_ifs="$IFS"
-IFS=$'\n'
-
 for f in $src_files; do
 	o=$(replace_ext "$f" "c" "o")
 	SRC_TARGETS=$(printf '%s\n\n%s: %s %s\n\t$(CC) $(CFLAGS) -o %s -c %s\n' \
 		"$SRC_TARGETS" "$o" "$headers" "$f" "$o" "$f")
 done

-IFS="$temp_ifs"
-
 contents=$(replace "$contents" "HEADERS" "$headers")

 contents=$(replace "$contents" "BC_ENABLED" "$bc")
@@ -110,7 +110,7 @@ define root(x,n){
 	if(n<0)sqrt(n)
 	n=n$
 	if(n==0)x/n
-	if(n==1)return x
+	if(x==0||n==1)return x
 	if(n==2)return sqrt(x)
 	s=scale
 	scale=0
@@ -39,7 +39,7 @@
 #include <status.h>
 #include <vm.h>

-void bc_args(int argc, char *argv[]);
+void bc_args(int argc, char *argv[], bool exit_exprs);

 extern const char* const bc_args_env_name;

@@ -176,11 +176,15 @@ typedef enum BcErr {
 #endif // __STDC_VERSION__

 #if defined(__clang__) || defined(__GNUC__)
-#if defined(__has_attribute) && __has_attribute(fallthrough)
+#if defined(__has_attribute)
+#if __has_attribute(fallthrough)
 #define BC_FALLTHROUGH __attribute__((fallthrough));
-#else // defined(__has_attribute) && __has_attribute(fallthrough)
+#else // __has_attribute(fallthrough)
 #define BC_FALLTHROUGH
-#endif // defined(__has_attribute) && __has_attribute(fallthrough)
+#endif // __has_attribute(fallthrough)
+#else // defined(__has_attribute)
+#define BC_FALLTHROUGH
+#endif // defined(__has_attribute)
 #else // defined(__clang__) || defined(__GNUC__)
 #define BC_FALLTHROUGH
 #endif // defined(__clang__) || defined(__GNUC__)
@@ -356,6 +356,7 @@ typedef struct BcVm {
 	uint16_t line_len;

 	bool no_exit_exprs;
+	bool exit_exprs;
 	bool eof;
 #endif // !BC_ENABLE_LIBRARY

@@ -121,20 +121,20 @@ else:

 p = run([ "make", "clean" ])

-print("Testing \"make -j4\"")
+print("Testing \"make -j12\"")

 if p.returncode != 0:
 	print("make returned an error ({}); exiting...".format(p.returncode))
 	sys.exit(p.returncode)

-p = run([ "make", "-j4" ])
+p = run([ "make", "-j12" ])

 if p.returncode == 0:
-	makecmd = [ "make", "-j4" ]
-	print("Using \"make -j4\"")
+	makecmd = [ "make", "-j12" ]
+	print("Using \"make -j12\"")
 else:
 	makecmd = [ "make" ]
-	print("Not using \"make -j4\"")
+	print("Not using \"make -j12\"")

 if test_num != 0:
 	mx2 = test_num
@@ -34,8 +34,7 @@ bc - arbitrary-precision decimal arithmetic language and calculator

 # SYNOPSIS

-**bc** [**-ghilPqsvVw**] [**--global-stacks**] [**--help**] [**--interactive**] [**--mathlib**] [**--no-prompt**] [**--quiet**] [**--standard**] [**--warn**] [**--version**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...]
-[*file*...]
+**bc** [**-ghilPqsvVw**] [**-\-global-stacks**] [**-\-help**] [**-\-interactive**] [**-\-mathlib**] [**-\-no-prompt**] [**-\-quiet**] [**-\-standard**] [**-\-warn**] [**-\-version**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -61,7 +60,7 @@ especially) the GNU bc(1).

 The following are the options that bc(1) accepts.

-**-g**, **--global-stacks**
+**-g**, **-\-global-stacks**

 {{ A H N P HN HP NP HNP }}
 :   Turns the globals **ibase**, **obase**, **scale**, and **seed** into stacks.
@@ -152,17 +151,17 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-l**, **--mathlib**
+**-l**, **-\-mathlib**

 :   Sets **scale** (see the **SYNTAX** section) to **20** and loads the included
 {{ A H N P HN HP NP HNP }}
@@ -178,7 +177,7 @@ The following are the options that bc(1) accepts.
    To learn what is in the library, see the **LIBRARY** section.
 {{ end }}

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 {{ A E H N EH EN HN EHN }}
 :   Disables the prompt in TTY mode. (The prompt is only enabled in TTY mode.
@@ -193,57 +192,64 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-q**, **--quiet**
+**-q**, **-\-quiet**

 :   This option is for compatibility with the [GNU bc(1)][2]; it is a no-op.
    Without this option, GNU bc(1) prints a copyright header. This bc(1) only
    prints the copyright header if one or more of the **-v**, **-V**, or
-    **--version** options are given.
+    **-\-version** options are given.

    This is a **non-portable extension**.

-**-s**, **--standard**
+**-s**, **-\-standard**

 :   Process exactly the language defined by the [standard][1] and error if any
    extensions are used.

    This is a **non-portable extension**.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

    This is a **non-portable extension**.

-**-w**, **--warn**
+**-w**, **-\-warn**

-:   Like **-s** and **--standard**, except that warnings (and not errors) are
+:   Like **-s** and **-\-standard**, except that warnings (and not errors) are
    printed for non-standard extensions and execution continues normally.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **BC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -251,7 +257,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other bc(1) implementations, this bc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -295,8 +303,8 @@ Identifiers with more than one character (letter) are a

 **ibase** is a global variable determining how to interpret constant numbers. It
 is the "input" base, or the number base used for interpreting input numbers.
-**ibase** is initially **10**. If the **-s** (**--standard**) and **-w**
-(**--warn**) flags were not given on the command line, the max allowable value
+**ibase** is initially **10**. If the **-s** (**-\-standard**) and **-w**
+(**-\-warn**) flags were not given on the command line, the max allowable value
 for **ibase** is **36**. Otherwise, it is **16**. The min allowable value for
 **ibase** is **2**. The max allowable value for **ibase** can be queried in
 bc(1) programs with the **maxibase()** built-in function.
@@ -503,7 +511,7 @@ The following arithmetic and logical operators can be used. They are listed in
 order of decreasing precedence. Operators in the same group have the same
 precedence.

-**++** **--**
+**++** **-\-**

 :   Type: Prefix and Postfix

@@ -608,7 +616,7 @@ precedence.

 The operators will be described in more detail below.

-**++** **--**
+**++** **-\-**

 :   The prefix and postfix **increment** and **decrement** operators behave
    exactly like they would in C. They require a named expression (see the
@@ -953,12 +961,12 @@ This is a **non-portable extension**.
 {{ A H N P HN HP NP HNP }}
 All of the functions below, including the functions in the extended math
 library (see the *Extended Library* subsection below), are available when the
-**-l** or **--mathlib** command-line flags are given, except that the extended
+**-l** or **-\-mathlib** command-line flags are given, except that the extended
 math library is not available when the **-s** option, the **-w** option, or
 equivalents are given.
 {{ end }}
 {{ E EH EN EP EHN EHP ENP EHNP }}
-All of the functions below  are available when the **-l** or **--mathlib**
+All of the functions below  are available when the **-l** or **-\-mathlib**
 command-line flags are given.
 {{ end }}

@@ -1011,8 +1019,8 @@ The [standard][1] defines the following functions for the math library:
 {{ A H N P HN HP NP HNP }}
 ## Extended Library

-The extended library is *not* loaded when the **-s**/**--standard** or
-**-w**/**--warn** options are given since they are not part of the library
+The extended library is *not* loaded when the **-s**/**-\-standard** or
+**-w**/**-\-warn** options are given since they are not part of the library
 defined by the [standard][1].

 The extended library is a **non-portable extension**.
@@ -1696,17 +1704,17 @@ The other statuses will only be returned when bc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since bc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Per the [standard][1], bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, bc(1) attempts to recover from errors (see the **RESET**
@@ -25,19 +25,18 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "BC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "BC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH NAME
 .PP
 bc - arbitrary-precision decimal arithmetic language and calculator
 .SH SYNOPSIS
 .PP
-\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]\[en]global-stacks\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]mathlib\f[R]] [\f[B]\[en]no-prompt\f[R]]
-[\f[B]\[en]quiet\f[R]] [\f[B]\[en]standard\f[R]] [\f[B]\[en]warn\f[R]]
-[\f[B]\[en]version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]--global-stacks\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--mathlib\f[R]]
+[\f[B]--no-prompt\f[R]] [\f[B]--quiet\f[R]] [\f[B]--standard\f[R]]
+[\f[B]--warn\f[R]] [\f[B]--version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -60,7 +59,7 @@ implementations.
 .PP
 The following are the options that bc(1) accepts.
 .TP
-\f[B]-g\f[R], \f[B]\[en]global-stacks\f[R]
+\f[B]-g\f[R], \f[B]--global-stacks\f[R]
 Turns the globals \f[B]ibase\f[R], \f[B]obase\f[R], \f[B]scale\f[R], and
 \f[B]seed\f[R] into stacks.
 .RS
@@ -152,10 +151,10 @@ is ignored.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -163,7 +162,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-l\f[R], \f[B]\[en]mathlib\f[R]
+\f[B]-l\f[R], \f[B]--mathlib\f[R]
 Sets \f[B]scale\f[R] (see the \f[B]SYNTAX\f[R] section) to \f[B]20\f[R]
 and loads the included math library and the extended math library before
 running any code, including any expressions or files specified on the
@@ -173,7 +172,7 @@ command line.
 To learn what is in the libraries, see the \f[B]LIBRARY\f[R] section.
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 Disables the prompt in TTY mode.
 (The prompt is only enabled in TTY mode.
 See the \f[B]TTY MODE\f[R] section) This is mostly for those users that
@@ -185,18 +184,18 @@ Most of those users would want to put this option in
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-q\f[R], \f[B]\[en]quiet\f[R]
+\f[B]-q\f[R], \f[B]--quiet\f[R]
 This option is for compatibility with the GNU
 bc(1) (https://www.gnu.org/software/bc/); it is a no-op.
 Without this option, GNU bc(1) prints a copyright header.
 This bc(1) only prints the copyright header if one or more of the
-\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]\[en]version\f[R] options are given.
+\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]--version\f[R] options are given.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-s\f[R], \f[B]\[en]standard\f[R]
+\f[B]-s\f[R], \f[B]--standard\f[R]
 Process exactly the language defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html)
 and error if any extensions are used.
@@ -205,15 +204,15 @@ and error if any extensions are used.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-w\f[R], \f[B]\[en]warn\f[R]
-Like \f[B]-s\f[R] and \f[B]\[en]standard\f[R], except that warnings (and
+\f[B]-w\f[R], \f[B]--warn\f[R]
+Like \f[B]-s\f[R] and \f[B]--standard\f[R], except that warnings (and
 not errors) are printed for non-standard extensions and execution
 continues normally.
 .RS
@@ -221,7 +220,7 @@ continues normally.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -230,26 +229,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]BC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -258,6 +267,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other bc(1) implementations, this bc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -309,8 +321,8 @@ constant numbers.
 It is the \[lq]input\[rq] base, or the number base used for interpreting
 input numbers.
 \f[B]ibase\f[R] is initially \f[B]10\f[R].
-If the \f[B]-s\f[R] (\f[B]\[en]standard\f[R]) and \f[B]-w\f[R]
-(\f[B]\[en]warn\f[R]) flags were not given on the command line, the max
+If the \f[B]-s\f[R] (\f[B]--standard\f[R]) and \f[B]-w\f[R]
+(\f[B]--warn\f[R]) flags were not given on the command line, the max
 allowable value for \f[B]ibase\f[R] is \f[B]36\f[R].
 Otherwise, it is \f[B]16\f[R].
 The min allowable value for \f[B]ibase\f[R] is \f[B]2\f[R].
@@ -569,7 +581,7 @@ The following arithmetic and logical operators can be used.
 They are listed in order of decreasing precedence.
 Operators in the same group have the same precedence.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 Type: Prefix and Postfix
 .RS
 .PP
@@ -679,7 +691,7 @@ Description: \f[B]boolean or\f[R]
 .PP
 The operators will be described in more detail below.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 The prefix and postfix \f[B]increment\f[R] and \f[B]decrement\f[R]
 operators behave exactly like they would in C.
 They require a named expression (see the \f[I]Named Expressions\f[R]
@@ -1125,7 +1137,7 @@ This is a \f[B]non-portable extension\f[R].
 .PP
 All of the functions below, including the functions in the extended math
 library (see the \f[I]Extended Library\f[R] subsection below), are
-available when the \f[B]-l\f[R] or \f[B]\[en]mathlib\f[R] command-line
+available when the \f[B]-l\f[R] or \f[B]--mathlib\f[R] command-line
 flags are given, except that the extended math library is not available
 when the \f[B]-s\f[R] option, the \f[B]-w\f[R] option, or equivalents
 are given.
@@ -1186,7 +1198,7 @@ Functions\f[R] subsection below).
 .SS Extended Library
 .PP
 The extended library is \f[I]not\f[R] loaded when the
-\f[B]-s\f[R]/\f[B]\[en]standard\f[R] or \f[B]-w\f[R]/\f[B]\[en]warn\f[R]
+\f[B]-s\f[R]/\f[B]--standard\f[R] or \f[B]-w\f[R]/\f[B]--warn\f[R]
 options are given since they are not part of the library defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html).
 .PP
@@ -1944,11 +1956,11 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 bc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Per the
@@ -1956,7 +1968,7 @@ standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html),
 bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, bc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,8 +34,7 @@ bc - arbitrary-precision decimal arithmetic language and calculator

 # SYNOPSIS

-**bc** [**-ghilPqsvVw**] [**--global-stacks**] [**--help**] [**--interactive**] [**--mathlib**] [**--no-prompt**] [**--quiet**] [**--standard**] [**--warn**] [**--version**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...]
-[*file*...]
+**bc** [**-ghilPqsvVw**] [**-\-global-stacks**] [**-\-help**] [**-\-interactive**] [**-\-mathlib**] [**-\-no-prompt**] [**-\-quiet**] [**-\-standard**] [**-\-warn**] [**-\-version**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -55,7 +54,7 @@ other implementations.

 The following are the options that bc(1) accepts.

-**-g**, **--global-stacks**
+**-g**, **-\-global-stacks**

 :   Turns the globals **ibase**, **obase**, **scale**, and **seed** into stacks.

@@ -123,17 +122,17 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-l**, **--mathlib**
+**-l**, **-\-mathlib**

 :   Sets **scale** (see the **SYNTAX** section) to **20** and loads the included
    math library and the extended math library before running any code,
@@ -141,7 +140,7 @@ The following are the options that bc(1) accepts.

    To learn what is in the libraries, see the **LIBRARY** section.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   Disables the prompt in TTY mode. (The prompt is only enabled in TTY mode.
    See the **TTY MODE** section) This is mostly for those users that do not
@@ -151,57 +150,64 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-q**, **--quiet**
+**-q**, **-\-quiet**

 :   This option is for compatibility with the [GNU bc(1)][2]; it is a no-op.
    Without this option, GNU bc(1) prints a copyright header. This bc(1) only
    prints the copyright header if one or more of the **-v**, **-V**, or
-    **--version** options are given.
+    **-\-version** options are given.

    This is a **non-portable extension**.

-**-s**, **--standard**
+**-s**, **-\-standard**

 :   Process exactly the language defined by the [standard][1] and error if any
    extensions are used.

    This is a **non-portable extension**.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

    This is a **non-portable extension**.

-**-w**, **--warn**
+**-w**, **-\-warn**

-:   Like **-s** and **--standard**, except that warnings (and not errors) are
+:   Like **-s** and **-\-standard**, except that warnings (and not errors) are
    printed for non-standard extensions and execution continues normally.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **BC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -209,7 +215,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other bc(1) implementations, this bc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -253,8 +261,8 @@ Identifiers with more than one character (letter) are a

 **ibase** is a global variable determining how to interpret constant numbers. It
 is the "input" base, or the number base used for interpreting input numbers.
-**ibase** is initially **10**. If the **-s** (**--standard**) and **-w**
-(**--warn**) flags were not given on the command line, the max allowable value
+**ibase** is initially **10**. If the **-s** (**-\-standard**) and **-w**
+(**-\-warn**) flags were not given on the command line, the max allowable value
 for **ibase** is **36**. Otherwise, it is **16**. The min allowable value for
 **ibase** is **2**. The max allowable value for **ibase** can be queried in
 bc(1) programs with the **maxibase()** built-in function.
@@ -444,7 +452,7 @@ The following arithmetic and logical operators can be used. They are listed in
 order of decreasing precedence. Operators in the same group have the same
 precedence.

-**++** **--**
+**++** **-\-**

 :   Type: Prefix and Postfix

@@ -542,7 +550,7 @@ precedence.

 The operators will be described in more detail below.

-**++** **--**
+**++** **-\-**

 :   The prefix and postfix **increment** and **decrement** operators behave
    exactly like they would in C. They require a named expression (see the
@@ -873,7 +881,7 @@ This is a **non-portable extension**.

 All of the functions below, including the functions in the extended math
 library (see the *Extended Library* subsection below), are available when the
-**-l** or **--mathlib** command-line flags are given, except that the extended
+**-l** or **-\-mathlib** command-line flags are given, except that the extended
 math library is not available when the **-s** option, the **-w** option, or
 equivalents are given.

@@ -925,8 +933,8 @@ The [standard][1] defines the following functions for the math library:

 ## Extended Library

-The extended library is *not* loaded when the **-s**/**--standard** or
-**-w**/**--warn** options are given since they are not part of the library
+The extended library is *not* loaded when the **-s**/**-\-standard** or
+**-w**/**-\-warn** options are given since they are not part of the library
 defined by the [standard][1].

 The extended library is a **non-portable extension**.
@@ -1594,17 +1602,17 @@ The other statuses will only be returned when bc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since bc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Per the [standard][1], bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, bc(1) attempts to recover from errors (see the **RESET**
@@ -25,19 +25,18 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "BC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "BC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH NAME
 .PP
 bc - arbitrary-precision decimal arithmetic language and calculator
 .SH SYNOPSIS
 .PP
-\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]\[en]global-stacks\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]mathlib\f[R]] [\f[B]\[en]no-prompt\f[R]]
-[\f[B]\[en]quiet\f[R]] [\f[B]\[en]standard\f[R]] [\f[B]\[en]warn\f[R]]
-[\f[B]\[en]version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]--global-stacks\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--mathlib\f[R]]
+[\f[B]--no-prompt\f[R]] [\f[B]--quiet\f[R]] [\f[B]--standard\f[R]]
+[\f[B]--warn\f[R]] [\f[B]--version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -58,7 +57,7 @@ This bc(1) is a drop-in replacement for \f[I]any\f[R] bc(1), including
 .PP
 The following are the options that bc(1) accepts.
 .PP
-\f[B]-g\f[R], \f[B]\[en]global-stacks\f[R]
+\f[B]-g\f[R], \f[B]--global-stacks\f[R]
 .IP
 .nf
 \f[C]
@@ -115,10 +114,10 @@ This is a **non-portable extension**.
 \f[R]
 .fi
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -126,7 +125,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-l\f[R], \f[B]\[en]mathlib\f[R]
+\f[B]-l\f[R], \f[B]--mathlib\f[R]
 Sets \f[B]scale\f[R] (see the \f[B]SYNTAX\f[R] section) to \f[B]20\f[R]
 and loads the included math library before running any code, including
 any expressions or files specified on the command line.
@@ -135,7 +134,7 @@ any expressions or files specified on the command line.
 To learn what is in the library, see the \f[B]LIBRARY\f[R] section.
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 Disables the prompt in TTY mode.
 (The prompt is only enabled in TTY mode.
 See the \f[B]TTY MODE\f[R] section) This is mostly for those users that
@@ -147,18 +146,18 @@ Most of those users would want to put this option in
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-q\f[R], \f[B]\[en]quiet\f[R]
+\f[B]-q\f[R], \f[B]--quiet\f[R]
 This option is for compatibility with the GNU
 bc(1) (https://www.gnu.org/software/bc/); it is a no-op.
 Without this option, GNU bc(1) prints a copyright header.
 This bc(1) only prints the copyright header if one or more of the
-\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]\[en]version\f[R] options are given.
+\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]--version\f[R] options are given.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-s\f[R], \f[B]\[en]standard\f[R]
+\f[B]-s\f[R], \f[B]--standard\f[R]
 Process exactly the language defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html)
 and error if any extensions are used.
@@ -167,15 +166,15 @@ and error if any extensions are used.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-w\f[R], \f[B]\[en]warn\f[R]
-Like \f[B]-s\f[R] and \f[B]\[en]standard\f[R], except that warnings (and
+\f[B]-w\f[R], \f[B]--warn\f[R]
+Like \f[B]-s\f[R] and \f[B]--standard\f[R], except that warnings (and
 not errors) are printed for non-standard extensions and execution
 continues normally.
 .RS
@@ -183,7 +182,7 @@ continues normally.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -192,26 +191,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]BC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -220,6 +229,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other bc(1) implementations, this bc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -271,8 +283,8 @@ constant numbers.
 It is the \[lq]input\[rq] base, or the number base used for interpreting
 input numbers.
 \f[B]ibase\f[R] is initially \f[B]10\f[R].
-If the \f[B]-s\f[R] (\f[B]\[en]standard\f[R]) and \f[B]-w\f[R]
-(\f[B]\[en]warn\f[R]) flags were not given on the command line, the max
+If the \f[B]-s\f[R] (\f[B]--standard\f[R]) and \f[B]-w\f[R]
+(\f[B]--warn\f[R]) flags were not given on the command line, the max
 allowable value for \f[B]ibase\f[R] is \f[B]36\f[R].
 Otherwise, it is \f[B]16\f[R].
 The min allowable value for \f[B]ibase\f[R] is \f[B]2\f[R].
@@ -432,7 +444,7 @@ The following arithmetic and logical operators can be used.
 They are listed in order of decreasing precedence.
 Operators in the same group have the same precedence.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 Type: Prefix and Postfix
 .RS
 .PP
@@ -515,7 +527,7 @@ Description: \f[B]boolean or\f[R]
 .PP
 The operators will be described in more detail below.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 The prefix and postfix \f[B]increment\f[R] and \f[B]decrement\f[R]
 operators behave exactly like they would in C.
 They require a named expression (see the \f[I]Named Expressions\f[R]
@@ -895,7 +907,7 @@ This is a \f[B]non-portable extension\f[R].
 .SH LIBRARY
 .PP
 All of the functions below are available when the \f[B]-l\f[R] or
-\f[B]\[en]mathlib\f[R] command-line flags are given.
+\f[B]--mathlib\f[R] command-line flags are given.
 .SS Standard Library
 .PP
 The
@@ -1200,11 +1212,11 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 bc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Per the
@@ -1212,7 +1224,7 @@ standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html),
 bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, bc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,8 +34,7 @@ bc - arbitrary-precision decimal arithmetic language and calculator

 # SYNOPSIS

-**bc** [**-ghilPqsvVw**] [**--global-stacks**] [**--help**] [**--interactive**] [**--mathlib**] [**--no-prompt**] [**--quiet**] [**--standard**] [**--warn**] [**--version**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...]
-[*file*...]
+**bc** [**-ghilPqsvVw**] [**-\-global-stacks**] [**-\-help**] [**-\-interactive**] [**-\-mathlib**] [**-\-no-prompt**] [**-\-quiet**] [**-\-standard**] [**-\-warn**] [**-\-version**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -54,7 +53,7 @@ especially) the GNU bc(1).

 The following are the options that bc(1) accepts.

-**-g**, **--global-stacks**
+**-g**, **-\-global-stacks**

    Turns the globals **ibase**, **obase**, and **scale** into stacks.

@@ -107,17 +106,17 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-l**, **--mathlib**
+**-l**, **-\-mathlib**

 :   Sets **scale** (see the **SYNTAX** section) to **20** and loads the included
    math library before running any code, including any expressions or files
@@ -125,7 +124,7 @@ The following are the options that bc(1) accepts.

    To learn what is in the library, see the **LIBRARY** section.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   Disables the prompt in TTY mode. (The prompt is only enabled in TTY mode.
    See the **TTY MODE** section) This is mostly for those users that do not
@@ -135,57 +134,64 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-q**, **--quiet**
+**-q**, **-\-quiet**

 :   This option is for compatibility with the [GNU bc(1)][2]; it is a no-op.
    Without this option, GNU bc(1) prints a copyright header. This bc(1) only
    prints the copyright header if one or more of the **-v**, **-V**, or
-    **--version** options are given.
+    **-\-version** options are given.

    This is a **non-portable extension**.

-**-s**, **--standard**
+**-s**, **-\-standard**

 :   Process exactly the language defined by the [standard][1] and error if any
    extensions are used.

    This is a **non-portable extension**.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

    This is a **non-portable extension**.

-**-w**, **--warn**
+**-w**, **-\-warn**

-:   Like **-s** and **--standard**, except that warnings (and not errors) are
+:   Like **-s** and **-\-standard**, except that warnings (and not errors) are
    printed for non-standard extensions and execution continues normally.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **BC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -193,7 +199,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other bc(1) implementations, this bc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -237,8 +245,8 @@ Identifiers with more than one character (letter) are a

 **ibase** is a global variable determining how to interpret constant numbers. It
 is the "input" base, or the number base used for interpreting input numbers.
-**ibase** is initially **10**. If the **-s** (**--standard**) and **-w**
-(**--warn**) flags were not given on the command line, the max allowable value
+**ibase** is initially **10**. If the **-s** (**-\-standard**) and **-w**
+(**-\-warn**) flags were not given on the command line, the max allowable value
 for **ibase** is **36**. Otherwise, it is **16**. The min allowable value for
 **ibase** is **2**. The max allowable value for **ibase** can be queried in
 bc(1) programs with the **maxibase()** built-in function.
@@ -357,7 +365,7 @@ The following arithmetic and logical operators can be used. They are listed in
 order of decreasing precedence. Operators in the same group have the same
 precedence.

-**++** **--**
+**++** **-\-**

 :   Type: Prefix and Postfix

@@ -431,7 +439,7 @@ precedence.

 The operators will be described in more detail below.

-**++** **--**
+**++** **-\-**

 :   The prefix and postfix **increment** and **decrement** operators behave
    exactly like they would in C. They require a named expression (see the
@@ -707,7 +715,7 @@ This is a **non-portable extension**.

 # LIBRARY

-All of the functions below  are available when the **-l** or **--mathlib**
+All of the functions below  are available when the **-l** or **-\-mathlib**
 command-line flags are given.

 ## Standard Library
@@ -983,17 +991,17 @@ The other statuses will only be returned when bc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since bc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Per the [standard][1], bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, bc(1) attempts to recover from errors (see the **RESET**
@@ -25,19 +25,18 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "BC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "BC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH NAME
 .PP
 bc - arbitrary-precision decimal arithmetic language and calculator
 .SH SYNOPSIS
 .PP
-\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]\[en]global-stacks\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]mathlib\f[R]] [\f[B]\[en]no-prompt\f[R]]
-[\f[B]\[en]quiet\f[R]] [\f[B]\[en]standard\f[R]] [\f[B]\[en]warn\f[R]]
-[\f[B]\[en]version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]--global-stacks\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--mathlib\f[R]]
+[\f[B]--no-prompt\f[R]] [\f[B]--quiet\f[R]] [\f[B]--standard\f[R]]
+[\f[B]--warn\f[R]] [\f[B]--version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -55,7 +54,7 @@ the command line and executes them before reading from \f[B]stdin\f[R].
 .PP
 The following are the options that bc(1) accepts.
 .PP
-\f[B]-g\f[R], \f[B]\[en]global-stacks\f[R]
+\f[B]-g\f[R], \f[B]--global-stacks\f[R]
 .IP
 .nf
 \f[C]
@@ -112,10 +111,10 @@ This is a **non-portable extension**.
 \f[R]
 .fi
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -123,7 +122,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-l\f[R], \f[B]\[en]mathlib\f[R]
+\f[B]-l\f[R], \f[B]--mathlib\f[R]
 Sets \f[B]scale\f[R] (see the \f[B]SYNTAX\f[R] section) to \f[B]20\f[R]
 and loads the included math library before running any code, including
 any expressions or files specified on the command line.
@@ -132,7 +131,7 @@ any expressions or files specified on the command line.
 To learn what is in the library, see the \f[B]LIBRARY\f[R] section.
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 Disables the prompt in TTY mode.
 (The prompt is only enabled in TTY mode.
 See the \f[B]TTY MODE\f[R] section) This is mostly for those users that
@@ -144,18 +143,18 @@ Most of those users would want to put this option in
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-q\f[R], \f[B]\[en]quiet\f[R]
+\f[B]-q\f[R], \f[B]--quiet\f[R]
 This option is for compatibility with the GNU
 bc(1) (https://www.gnu.org/software/bc/); it is a no-op.
 Without this option, GNU bc(1) prints a copyright header.
 This bc(1) only prints the copyright header if one or more of the
-\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]\[en]version\f[R] options are given.
+\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]--version\f[R] options are given.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-s\f[R], \f[B]\[en]standard\f[R]
+\f[B]-s\f[R], \f[B]--standard\f[R]
 Process exactly the language defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html)
 and error if any extensions are used.
@@ -164,15 +163,15 @@ and error if any extensions are used.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-w\f[R], \f[B]\[en]warn\f[R]
-Like \f[B]-s\f[R] and \f[B]\[en]standard\f[R], except that warnings (and
+\f[B]-w\f[R], \f[B]--warn\f[R]
+Like \f[B]-s\f[R] and \f[B]--standard\f[R], except that warnings (and
 not errors) are printed for non-standard extensions and execution
 continues normally.
 .RS
@@ -180,7 +179,7 @@ continues normally.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -189,26 +188,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]BC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -217,6 +226,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other bc(1) implementations, this bc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -268,8 +280,8 @@ constant numbers.
 It is the \[lq]input\[rq] base, or the number base used for interpreting
 input numbers.
 \f[B]ibase\f[R] is initially \f[B]10\f[R].
-If the \f[B]-s\f[R] (\f[B]\[en]standard\f[R]) and \f[B]-w\f[R]
-(\f[B]\[en]warn\f[R]) flags were not given on the command line, the max
+If the \f[B]-s\f[R] (\f[B]--standard\f[R]) and \f[B]-w\f[R]
+(\f[B]--warn\f[R]) flags were not given on the command line, the max
 allowable value for \f[B]ibase\f[R] is \f[B]36\f[R].
 Otherwise, it is \f[B]16\f[R].
 The min allowable value for \f[B]ibase\f[R] is \f[B]2\f[R].
@@ -429,7 +441,7 @@ The following arithmetic and logical operators can be used.
 They are listed in order of decreasing precedence.
 Operators in the same group have the same precedence.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 Type: Prefix and Postfix
 .RS
 .PP
@@ -512,7 +524,7 @@ Description: \f[B]boolean or\f[R]
 .PP
 The operators will be described in more detail below.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 The prefix and postfix \f[B]increment\f[R] and \f[B]decrement\f[R]
 operators behave exactly like they would in C.
 They require a named expression (see the \f[I]Named Expressions\f[R]
@@ -892,7 +904,7 @@ This is a \f[B]non-portable extension\f[R].
 .SH LIBRARY
 .PP
 All of the functions below are available when the \f[B]-l\f[R] or
-\f[B]\[en]mathlib\f[R] command-line flags are given.
+\f[B]--mathlib\f[R] command-line flags are given.
 .SS Standard Library
 .PP
 The
@@ -1197,11 +1209,11 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 bc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Per the
@@ -1209,7 +1221,7 @@ standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html),
 bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, bc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,8 +34,7 @@ bc - arbitrary-precision decimal arithmetic language and calculator

 # SYNOPSIS

-**bc** [**-ghilPqsvVw**] [**--global-stacks**] [**--help**] [**--interactive**] [**--mathlib**] [**--no-prompt**] [**--quiet**] [**--standard**] [**--warn**] [**--version**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...]
-[*file*...]
+**bc** [**-ghilPqsvVw**] [**-\-global-stacks**] [**-\-help**] [**-\-interactive**] [**-\-mathlib**] [**-\-no-prompt**] [**-\-quiet**] [**-\-standard**] [**-\-warn**] [**-\-version**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -51,7 +50,7 @@ command line and executes them before reading from **stdin**.

 The following are the options that bc(1) accepts.

-**-g**, **--global-stacks**
+**-g**, **-\-global-stacks**

    Turns the globals **ibase**, **obase**, and **scale** into stacks.

@@ -104,17 +103,17 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-l**, **--mathlib**
+**-l**, **-\-mathlib**

 :   Sets **scale** (see the **SYNTAX** section) to **20** and loads the included
    math library before running any code, including any expressions or files
@@ -122,7 +121,7 @@ The following are the options that bc(1) accepts.

    To learn what is in the library, see the **LIBRARY** section.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   Disables the prompt in TTY mode. (The prompt is only enabled in TTY mode.
    See the **TTY MODE** section) This is mostly for those users that do not
@@ -132,57 +131,64 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-q**, **--quiet**
+**-q**, **-\-quiet**

 :   This option is for compatibility with the [GNU bc(1)][2]; it is a no-op.
    Without this option, GNU bc(1) prints a copyright header. This bc(1) only
    prints the copyright header if one or more of the **-v**, **-V**, or
-    **--version** options are given.
+    **-\-version** options are given.

    This is a **non-portable extension**.

-**-s**, **--standard**
+**-s**, **-\-standard**

 :   Process exactly the language defined by the [standard][1] and error if any
    extensions are used.

    This is a **non-portable extension**.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

    This is a **non-portable extension**.

-**-w**, **--warn**
+**-w**, **-\-warn**

-:   Like **-s** and **--standard**, except that warnings (and not errors) are
+:   Like **-s** and **-\-standard**, except that warnings (and not errors) are
    printed for non-standard extensions and execution continues normally.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **BC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -190,7 +196,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other bc(1) implementations, this bc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -234,8 +242,8 @@ Identifiers with more than one character (letter) are a

 **ibase** is a global variable determining how to interpret constant numbers. It
 is the "input" base, or the number base used for interpreting input numbers.
-**ibase** is initially **10**. If the **-s** (**--standard**) and **-w**
-(**--warn**) flags were not given on the command line, the max allowable value
+**ibase** is initially **10**. If the **-s** (**-\-standard**) and **-w**
+(**-\-warn**) flags were not given on the command line, the max allowable value
 for **ibase** is **36**. Otherwise, it is **16**. The min allowable value for
 **ibase** is **2**. The max allowable value for **ibase** can be queried in
 bc(1) programs with the **maxibase()** built-in function.
@@ -354,7 +362,7 @@ The following arithmetic and logical operators can be used. They are listed in
 order of decreasing precedence. Operators in the same group have the same
 precedence.

-**++** **--**
+**++** **-\-**

 :   Type: Prefix and Postfix

@@ -428,7 +436,7 @@ precedence.

 The operators will be described in more detail below.

-**++** **--**
+**++** **-\-**

 :   The prefix and postfix **increment** and **decrement** operators behave
    exactly like they would in C. They require a named expression (see the
@@ -704,7 +712,7 @@ This is a **non-portable extension**.

 # LIBRARY

-All of the functions below  are available when the **-l** or **--mathlib**
+All of the functions below  are available when the **-l** or **-\-mathlib**
 command-line flags are given.

 ## Standard Library
@@ -980,17 +988,17 @@ The other statuses will only be returned when bc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since bc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Per the [standard][1], bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, bc(1) attempts to recover from errors (see the **RESET**
@@ -25,19 +25,18 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "BC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "BC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH NAME
 .PP
 bc - arbitrary-precision decimal arithmetic language and calculator
 .SH SYNOPSIS
 .PP
-\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]\[en]global-stacks\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]mathlib\f[R]] [\f[B]\[en]no-prompt\f[R]]
-[\f[B]\[en]quiet\f[R]] [\f[B]\[en]standard\f[R]] [\f[B]\[en]warn\f[R]]
-[\f[B]\[en]version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]--global-stacks\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--mathlib\f[R]]
+[\f[B]--no-prompt\f[R]] [\f[B]--quiet\f[R]] [\f[B]--standard\f[R]]
+[\f[B]--warn\f[R]] [\f[B]--version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -55,7 +54,7 @@ the command line and executes them before reading from \f[B]stdin\f[R].
 .PP
 The following are the options that bc(1) accepts.
 .PP
-\f[B]-g\f[R], \f[B]\[en]global-stacks\f[R]
+\f[B]-g\f[R], \f[B]--global-stacks\f[R]
 .IP
 .nf
 \f[C]
@@ -112,10 +111,10 @@ This is a **non-portable extension**.
 \f[R]
 .fi
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -123,7 +122,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-l\f[R], \f[B]\[en]mathlib\f[R]
+\f[B]-l\f[R], \f[B]--mathlib\f[R]
 Sets \f[B]scale\f[R] (see the \f[B]SYNTAX\f[R] section) to \f[B]20\f[R]
 and loads the included math library before running any code, including
 any expressions or files specified on the command line.
@@ -132,7 +131,7 @@ any expressions or files specified on the command line.
 To learn what is in the library, see the \f[B]LIBRARY\f[R] section.
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 Disables the prompt in TTY mode.
 (The prompt is only enabled in TTY mode.
 See the \f[B]TTY MODE\f[R] section) This is mostly for those users that
@@ -144,18 +143,18 @@ Most of those users would want to put this option in
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-q\f[R], \f[B]\[en]quiet\f[R]
+\f[B]-q\f[R], \f[B]--quiet\f[R]
 This option is for compatibility with the GNU
 bc(1) (https://www.gnu.org/software/bc/); it is a no-op.
 Without this option, GNU bc(1) prints a copyright header.
 This bc(1) only prints the copyright header if one or more of the
-\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]\[en]version\f[R] options are given.
+\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]--version\f[R] options are given.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-s\f[R], \f[B]\[en]standard\f[R]
+\f[B]-s\f[R], \f[B]--standard\f[R]
 Process exactly the language defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html)
 and error if any extensions are used.
@@ -164,15 +163,15 @@ and error if any extensions are used.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-w\f[R], \f[B]\[en]warn\f[R]
-Like \f[B]-s\f[R] and \f[B]\[en]standard\f[R], except that warnings (and
+\f[B]-w\f[R], \f[B]--warn\f[R]
+Like \f[B]-s\f[R] and \f[B]--standard\f[R], except that warnings (and
 not errors) are printed for non-standard extensions and execution
 continues normally.
 .RS
@@ -180,7 +179,7 @@ continues normally.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -189,26 +188,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]BC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -217,6 +226,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other bc(1) implementations, this bc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -268,8 +280,8 @@ constant numbers.
 It is the \[lq]input\[rq] base, or the number base used for interpreting
 input numbers.
 \f[B]ibase\f[R] is initially \f[B]10\f[R].
-If the \f[B]-s\f[R] (\f[B]\[en]standard\f[R]) and \f[B]-w\f[R]
-(\f[B]\[en]warn\f[R]) flags were not given on the command line, the max
+If the \f[B]-s\f[R] (\f[B]--standard\f[R]) and \f[B]-w\f[R]
+(\f[B]--warn\f[R]) flags were not given on the command line, the max
 allowable value for \f[B]ibase\f[R] is \f[B]36\f[R].
 Otherwise, it is \f[B]16\f[R].
 The min allowable value for \f[B]ibase\f[R] is \f[B]2\f[R].
@@ -429,7 +441,7 @@ The following arithmetic and logical operators can be used.
 They are listed in order of decreasing precedence.
 Operators in the same group have the same precedence.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 Type: Prefix and Postfix
 .RS
 .PP
@@ -512,7 +524,7 @@ Description: \f[B]boolean or\f[R]
 .PP
 The operators will be described in more detail below.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 The prefix and postfix \f[B]increment\f[R] and \f[B]decrement\f[R]
 operators behave exactly like they would in C.
 They require a named expression (see the \f[I]Named Expressions\f[R]
@@ -892,7 +904,7 @@ This is a \f[B]non-portable extension\f[R].
 .SH LIBRARY
 .PP
 All of the functions below are available when the \f[B]-l\f[R] or
-\f[B]\[en]mathlib\f[R] command-line flags are given.
+\f[B]--mathlib\f[R] command-line flags are given.
 .SS Standard Library
 .PP
 The
@@ -1197,11 +1209,11 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 bc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Per the
@@ -1209,7 +1221,7 @@ standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html),
 bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, bc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,8 +34,7 @@ bc - arbitrary-precision decimal arithmetic language and calculator

 # SYNOPSIS

-**bc** [**-ghilPqsvVw**] [**--global-stacks**] [**--help**] [**--interactive**] [**--mathlib**] [**--no-prompt**] [**--quiet**] [**--standard**] [**--warn**] [**--version**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...]
-[*file*...]
+**bc** [**-ghilPqsvVw**] [**-\-global-stacks**] [**-\-help**] [**-\-interactive**] [**-\-mathlib**] [**-\-no-prompt**] [**-\-quiet**] [**-\-standard**] [**-\-warn**] [**-\-version**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -51,7 +50,7 @@ command line and executes them before reading from **stdin**.

 The following are the options that bc(1) accepts.

-**-g**, **--global-stacks**
+**-g**, **-\-global-stacks**

    Turns the globals **ibase**, **obase**, and **scale** into stacks.

@@ -104,17 +103,17 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-l**, **--mathlib**
+**-l**, **-\-mathlib**

 :   Sets **scale** (see the **SYNTAX** section) to **20** and loads the included
    math library before running any code, including any expressions or files
@@ -122,7 +121,7 @@ The following are the options that bc(1) accepts.

    To learn what is in the library, see the **LIBRARY** section.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   Disables the prompt in TTY mode. (The prompt is only enabled in TTY mode.
    See the **TTY MODE** section) This is mostly for those users that do not
@@ -132,57 +131,64 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-q**, **--quiet**
+**-q**, **-\-quiet**

 :   This option is for compatibility with the [GNU bc(1)][2]; it is a no-op.
    Without this option, GNU bc(1) prints a copyright header. This bc(1) only
    prints the copyright header if one or more of the **-v**, **-V**, or
-    **--version** options are given.
+    **-\-version** options are given.

    This is a **non-portable extension**.

-**-s**, **--standard**
+**-s**, **-\-standard**

 :   Process exactly the language defined by the [standard][1] and error if any
    extensions are used.

    This is a **non-portable extension**.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

    This is a **non-portable extension**.

-**-w**, **--warn**
+**-w**, **-\-warn**

-:   Like **-s** and **--standard**, except that warnings (and not errors) are
+:   Like **-s** and **-\-standard**, except that warnings (and not errors) are
    printed for non-standard extensions and execution continues normally.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **BC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -190,7 +196,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other bc(1) implementations, this bc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -234,8 +242,8 @@ Identifiers with more than one character (letter) are a

 **ibase** is a global variable determining how to interpret constant numbers. It
 is the "input" base, or the number base used for interpreting input numbers.
-**ibase** is initially **10**. If the **-s** (**--standard**) and **-w**
-(**--warn**) flags were not given on the command line, the max allowable value
+**ibase** is initially **10**. If the **-s** (**-\-standard**) and **-w**
+(**-\-warn**) flags were not given on the command line, the max allowable value
 for **ibase** is **36**. Otherwise, it is **16**. The min allowable value for
 **ibase** is **2**. The max allowable value for **ibase** can be queried in
 bc(1) programs with the **maxibase()** built-in function.
@@ -354,7 +362,7 @@ The following arithmetic and logical operators can be used. They are listed in
 order of decreasing precedence. Operators in the same group have the same
 precedence.

-**++** **--**
+**++** **-\-**

 :   Type: Prefix and Postfix

@@ -428,7 +436,7 @@ precedence.

 The operators will be described in more detail below.

-**++** **--**
+**++** **-\-**

 :   The prefix and postfix **increment** and **decrement** operators behave
    exactly like they would in C. They require a named expression (see the
@@ -704,7 +712,7 @@ This is a **non-portable extension**.

 # LIBRARY

-All of the functions below  are available when the **-l** or **--mathlib**
+All of the functions below  are available when the **-l** or **-\-mathlib**
 command-line flags are given.

 ## Standard Library
@@ -980,17 +988,17 @@ The other statuses will only be returned when bc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since bc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Per the [standard][1], bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, bc(1) attempts to recover from errors (see the **RESET**
@@ -25,19 +25,18 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "BC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "BC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH NAME
 .PP
 bc - arbitrary-precision decimal arithmetic language and calculator
 .SH SYNOPSIS
 .PP
-\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]\[en]global-stacks\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]mathlib\f[R]] [\f[B]\[en]no-prompt\f[R]]
-[\f[B]\[en]quiet\f[R]] [\f[B]\[en]standard\f[R]] [\f[B]\[en]warn\f[R]]
-[\f[B]\[en]version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]--global-stacks\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--mathlib\f[R]]
+[\f[B]--no-prompt\f[R]] [\f[B]--quiet\f[R]] [\f[B]--standard\f[R]]
+[\f[B]--warn\f[R]] [\f[B]--version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -55,7 +54,7 @@ the command line and executes them before reading from \f[B]stdin\f[R].
 .PP
 The following are the options that bc(1) accepts.
 .PP
-\f[B]-g\f[R], \f[B]\[en]global-stacks\f[R]
+\f[B]-g\f[R], \f[B]--global-stacks\f[R]
 .IP
 .nf
 \f[C]
@@ -112,10 +111,10 @@ This is a **non-portable extension**.
 \f[R]
 .fi
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -123,7 +122,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-l\f[R], \f[B]\[en]mathlib\f[R]
+\f[B]-l\f[R], \f[B]--mathlib\f[R]
 Sets \f[B]scale\f[R] (see the \f[B]SYNTAX\f[R] section) to \f[B]20\f[R]
 and loads the included math library before running any code, including
 any expressions or files specified on the command line.
@@ -132,25 +131,25 @@ any expressions or files specified on the command line.
 To learn what is in the library, see the \f[B]LIBRARY\f[R] section.
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 This option is a no-op.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-q\f[R], \f[B]\[en]quiet\f[R]
+\f[B]-q\f[R], \f[B]--quiet\f[R]
 This option is for compatibility with the GNU
 bc(1) (https://www.gnu.org/software/bc/); it is a no-op.
 Without this option, GNU bc(1) prints a copyright header.
 This bc(1) only prints the copyright header if one or more of the
-\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]\[en]version\f[R] options are given.
+\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]--version\f[R] options are given.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-s\f[R], \f[B]\[en]standard\f[R]
+\f[B]-s\f[R], \f[B]--standard\f[R]
 Process exactly the language defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html)
 and error if any extensions are used.
@@ -159,15 +158,15 @@ and error if any extensions are used.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-w\f[R], \f[B]\[en]warn\f[R]
-Like \f[B]-s\f[R] and \f[B]\[en]standard\f[R], except that warnings (and
+\f[B]-w\f[R], \f[B]--warn\f[R]
+Like \f[B]-s\f[R] and \f[B]--standard\f[R], except that warnings (and
 not errors) are printed for non-standard extensions and execution
 continues normally.
 .RS
@@ -175,7 +174,7 @@ continues normally.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -184,26 +183,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]BC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -212,6 +221,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other bc(1) implementations, this bc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -263,8 +275,8 @@ constant numbers.
 It is the \[lq]input\[rq] base, or the number base used for interpreting
 input numbers.
 \f[B]ibase\f[R] is initially \f[B]10\f[R].
-If the \f[B]-s\f[R] (\f[B]\[en]standard\f[R]) and \f[B]-w\f[R]
-(\f[B]\[en]warn\f[R]) flags were not given on the command line, the max
+If the \f[B]-s\f[R] (\f[B]--standard\f[R]) and \f[B]-w\f[R]
+(\f[B]--warn\f[R]) flags were not given on the command line, the max
 allowable value for \f[B]ibase\f[R] is \f[B]36\f[R].
 Otherwise, it is \f[B]16\f[R].
 The min allowable value for \f[B]ibase\f[R] is \f[B]2\f[R].
@@ -424,7 +436,7 @@ The following arithmetic and logical operators can be used.
 They are listed in order of decreasing precedence.
 Operators in the same group have the same precedence.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 Type: Prefix and Postfix
 .RS
 .PP
@@ -507,7 +519,7 @@ Description: \f[B]boolean or\f[R]
 .PP
 The operators will be described in more detail below.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 The prefix and postfix \f[B]increment\f[R] and \f[B]decrement\f[R]
 operators behave exactly like they would in C.
 They require a named expression (see the \f[I]Named Expressions\f[R]
@@ -887,7 +899,7 @@ This is a \f[B]non-portable extension\f[R].
 .SH LIBRARY
 .PP
 All of the functions below are available when the \f[B]-l\f[R] or
-\f[B]\[en]mathlib\f[R] command-line flags are given.
+\f[B]--mathlib\f[R] command-line flags are given.
 .SS Standard Library
 .PP
 The
@@ -1192,11 +1204,11 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 bc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Per the
@@ -1204,7 +1216,7 @@ standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html),
 bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, bc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,8 +34,7 @@ bc - arbitrary-precision decimal arithmetic language and calculator

 # SYNOPSIS

-**bc** [**-ghilPqsvVw**] [**--global-stacks**] [**--help**] [**--interactive**] [**--mathlib**] [**--no-prompt**] [**--quiet**] [**--standard**] [**--warn**] [**--version**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...]
-[*file*...]
+**bc** [**-ghilPqsvVw**] [**-\-global-stacks**] [**-\-help**] [**-\-interactive**] [**-\-mathlib**] [**-\-no-prompt**] [**-\-quiet**] [**-\-standard**] [**-\-warn**] [**-\-version**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -51,7 +50,7 @@ command line and executes them before reading from **stdin**.

 The following are the options that bc(1) accepts.

-**-g**, **--global-stacks**
+**-g**, **-\-global-stacks**

    Turns the globals **ibase**, **obase**, and **scale** into stacks.

@@ -104,17 +103,17 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-l**, **--mathlib**
+**-l**, **-\-mathlib**

 :   Sets **scale** (see the **SYNTAX** section) to **20** and loads the included
    math library before running any code, including any expressions or files
@@ -122,63 +121,70 @@ The following are the options that bc(1) accepts.

    To learn what is in the library, see the **LIBRARY** section.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   This option is a no-op.

    This is a **non-portable extension**.

-**-q**, **--quiet**
+**-q**, **-\-quiet**

 :   This option is for compatibility with the [GNU bc(1)][2]; it is a no-op.
    Without this option, GNU bc(1) prints a copyright header. This bc(1) only
    prints the copyright header if one or more of the **-v**, **-V**, or
-    **--version** options are given.
+    **-\-version** options are given.

    This is a **non-portable extension**.

-**-s**, **--standard**
+**-s**, **-\-standard**

 :   Process exactly the language defined by the [standard][1] and error if any
    extensions are used.

    This is a **non-portable extension**.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

    This is a **non-portable extension**.

-**-w**, **--warn**
+**-w**, **-\-warn**

-:   Like **-s** and **--standard**, except that warnings (and not errors) are
+:   Like **-s** and **-\-standard**, except that warnings (and not errors) are
    printed for non-standard extensions and execution continues normally.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **BC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -186,7 +192,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other bc(1) implementations, this bc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -230,8 +238,8 @@ Identifiers with more than one character (letter) are a

 **ibase** is a global variable determining how to interpret constant numbers. It
 is the "input" base, or the number base used for interpreting input numbers.
-**ibase** is initially **10**. If the **-s** (**--standard**) and **-w**
-(**--warn**) flags were not given on the command line, the max allowable value
+**ibase** is initially **10**. If the **-s** (**-\-standard**) and **-w**
+(**-\-warn**) flags were not given on the command line, the max allowable value
 for **ibase** is **36**. Otherwise, it is **16**. The min allowable value for
 **ibase** is **2**. The max allowable value for **ibase** can be queried in
 bc(1) programs with the **maxibase()** built-in function.
@@ -350,7 +358,7 @@ The following arithmetic and logical operators can be used. They are listed in
 order of decreasing precedence. Operators in the same group have the same
 precedence.

-**++** **--**
+**++** **-\-**

 :   Type: Prefix and Postfix

@@ -424,7 +432,7 @@ precedence.

 The operators will be described in more detail below.

-**++** **--**
+**++** **-\-**

 :   The prefix and postfix **increment** and **decrement** operators behave
    exactly like they would in C. They require a named expression (see the
@@ -700,7 +708,7 @@ This is a **non-portable extension**.

 # LIBRARY

-All of the functions below  are available when the **-l** or **--mathlib**
+All of the functions below  are available when the **-l** or **-\-mathlib**
 command-line flags are given.

 ## Standard Library
@@ -976,17 +984,17 @@ The other statuses will only be returned when bc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since bc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Per the [standard][1], bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, bc(1) attempts to recover from errors (see the **RESET**
@@ -25,19 +25,18 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "BC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "BC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH NAME
 .PP
 bc - arbitrary-precision decimal arithmetic language and calculator
 .SH SYNOPSIS
 .PP
-\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]\[en]global-stacks\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]mathlib\f[R]] [\f[B]\[en]no-prompt\f[R]]
-[\f[B]\[en]quiet\f[R]] [\f[B]\[en]standard\f[R]] [\f[B]\[en]warn\f[R]]
-[\f[B]\[en]version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]--global-stacks\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--mathlib\f[R]]
+[\f[B]--no-prompt\f[R]] [\f[B]--quiet\f[R]] [\f[B]--standard\f[R]]
+[\f[B]--warn\f[R]] [\f[B]--version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -55,7 +54,7 @@ the command line and executes them before reading from \f[B]stdin\f[R].
 .PP
 The following are the options that bc(1) accepts.
 .PP
-\f[B]-g\f[R], \f[B]\[en]global-stacks\f[R]
+\f[B]-g\f[R], \f[B]--global-stacks\f[R]
 .IP
 .nf
 \f[C]
@@ -112,10 +111,10 @@ This is a **non-portable extension**.
 \f[R]
 .fi
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -123,7 +122,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-l\f[R], \f[B]\[en]mathlib\f[R]
+\f[B]-l\f[R], \f[B]--mathlib\f[R]
 Sets \f[B]scale\f[R] (see the \f[B]SYNTAX\f[R] section) to \f[B]20\f[R]
 and loads the included math library before running any code, including
 any expressions or files specified on the command line.
@@ -132,25 +131,25 @@ any expressions or files specified on the command line.
 To learn what is in the library, see the \f[B]LIBRARY\f[R] section.
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 This option is a no-op.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-q\f[R], \f[B]\[en]quiet\f[R]
+\f[B]-q\f[R], \f[B]--quiet\f[R]
 This option is for compatibility with the GNU
 bc(1) (https://www.gnu.org/software/bc/); it is a no-op.
 Without this option, GNU bc(1) prints a copyright header.
 This bc(1) only prints the copyright header if one or more of the
-\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]\[en]version\f[R] options are given.
+\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]--version\f[R] options are given.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-s\f[R], \f[B]\[en]standard\f[R]
+\f[B]-s\f[R], \f[B]--standard\f[R]
 Process exactly the language defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html)
 and error if any extensions are used.
@@ -159,15 +158,15 @@ and error if any extensions are used.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-w\f[R], \f[B]\[en]warn\f[R]
-Like \f[B]-s\f[R] and \f[B]\[en]standard\f[R], except that warnings (and
+\f[B]-w\f[R], \f[B]--warn\f[R]
+Like \f[B]-s\f[R] and \f[B]--standard\f[R], except that warnings (and
 not errors) are printed for non-standard extensions and execution
 continues normally.
 .RS
@@ -175,7 +174,7 @@ continues normally.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -184,26 +183,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]BC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -212,6 +221,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other bc(1) implementations, this bc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -263,8 +275,8 @@ constant numbers.
 It is the \[lq]input\[rq] base, or the number base used for interpreting
 input numbers.
 \f[B]ibase\f[R] is initially \f[B]10\f[R].
-If the \f[B]-s\f[R] (\f[B]\[en]standard\f[R]) and \f[B]-w\f[R]
-(\f[B]\[en]warn\f[R]) flags were not given on the command line, the max
+If the \f[B]-s\f[R] (\f[B]--standard\f[R]) and \f[B]-w\f[R]
+(\f[B]--warn\f[R]) flags were not given on the command line, the max
 allowable value for \f[B]ibase\f[R] is \f[B]36\f[R].
 Otherwise, it is \f[B]16\f[R].
 The min allowable value for \f[B]ibase\f[R] is \f[B]2\f[R].
@@ -424,7 +436,7 @@ The following arithmetic and logical operators can be used.
 They are listed in order of decreasing precedence.
 Operators in the same group have the same precedence.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 Type: Prefix and Postfix
 .RS
 .PP
@@ -507,7 +519,7 @@ Description: \f[B]boolean or\f[R]
 .PP
 The operators will be described in more detail below.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 The prefix and postfix \f[B]increment\f[R] and \f[B]decrement\f[R]
 operators behave exactly like they would in C.
 They require a named expression (see the \f[I]Named Expressions\f[R]
@@ -887,7 +899,7 @@ This is a \f[B]non-portable extension\f[R].
 .SH LIBRARY
 .PP
 All of the functions below are available when the \f[B]-l\f[R] or
-\f[B]\[en]mathlib\f[R] command-line flags are given.
+\f[B]--mathlib\f[R] command-line flags are given.
 .SS Standard Library
 .PP
 The
@@ -1192,11 +1204,11 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 bc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Per the
@@ -1204,7 +1216,7 @@ standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html),
 bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, bc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,8 +34,7 @@ bc - arbitrary-precision decimal arithmetic language and calculator

 # SYNOPSIS

-**bc** [**-ghilPqsvVw**] [**--global-stacks**] [**--help**] [**--interactive**] [**--mathlib**] [**--no-prompt**] [**--quiet**] [**--standard**] [**--warn**] [**--version**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...]
-[*file*...]
+**bc** [**-ghilPqsvVw**] [**-\-global-stacks**] [**-\-help**] [**-\-interactive**] [**-\-mathlib**] [**-\-no-prompt**] [**-\-quiet**] [**-\-standard**] [**-\-warn**] [**-\-version**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -51,7 +50,7 @@ command line and executes them before reading from **stdin**.

 The following are the options that bc(1) accepts.

-**-g**, **--global-stacks**
+**-g**, **-\-global-stacks**

    Turns the globals **ibase**, **obase**, and **scale** into stacks.

@@ -104,17 +103,17 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-l**, **--mathlib**
+**-l**, **-\-mathlib**

 :   Sets **scale** (see the **SYNTAX** section) to **20** and loads the included
    math library before running any code, including any expressions or files
@@ -122,63 +121,70 @@ The following are the options that bc(1) accepts.

    To learn what is in the library, see the **LIBRARY** section.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   This option is a no-op.

    This is a **non-portable extension**.

-**-q**, **--quiet**
+**-q**, **-\-quiet**

 :   This option is for compatibility with the [GNU bc(1)][2]; it is a no-op.
    Without this option, GNU bc(1) prints a copyright header. This bc(1) only
    prints the copyright header if one or more of the **-v**, **-V**, or
-    **--version** options are given.
+    **-\-version** options are given.

    This is a **non-portable extension**.

-**-s**, **--standard**
+**-s**, **-\-standard**

 :   Process exactly the language defined by the [standard][1] and error if any
    extensions are used.

    This is a **non-portable extension**.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

    This is a **non-portable extension**.

-**-w**, **--warn**
+**-w**, **-\-warn**

-:   Like **-s** and **--standard**, except that warnings (and not errors) are
+:   Like **-s** and **-\-standard**, except that warnings (and not errors) are
    printed for non-standard extensions and execution continues normally.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **BC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -186,7 +192,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other bc(1) implementations, this bc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -230,8 +238,8 @@ Identifiers with more than one character (letter) are a

 **ibase** is a global variable determining how to interpret constant numbers. It
 is the "input" base, or the number base used for interpreting input numbers.
-**ibase** is initially **10**. If the **-s** (**--standard**) and **-w**
-(**--warn**) flags were not given on the command line, the max allowable value
+**ibase** is initially **10**. If the **-s** (**-\-standard**) and **-w**
+(**-\-warn**) flags were not given on the command line, the max allowable value
 for **ibase** is **36**. Otherwise, it is **16**. The min allowable value for
 **ibase** is **2**. The max allowable value for **ibase** can be queried in
 bc(1) programs with the **maxibase()** built-in function.
@@ -350,7 +358,7 @@ The following arithmetic and logical operators can be used. They are listed in
 order of decreasing precedence. Operators in the same group have the same
 precedence.

-**++** **--**
+**++** **-\-**

 :   Type: Prefix and Postfix

@@ -424,7 +432,7 @@ precedence.

 The operators will be described in more detail below.

-**++** **--**
+**++** **-\-**

 :   The prefix and postfix **increment** and **decrement** operators behave
    exactly like they would in C. They require a named expression (see the
@@ -700,7 +708,7 @@ This is a **non-portable extension**.

 # LIBRARY

-All of the functions below  are available when the **-l** or **--mathlib**
+All of the functions below  are available when the **-l** or **-\-mathlib**
 command-line flags are given.

 ## Standard Library
@@ -976,17 +984,17 @@ The other statuses will only be returned when bc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since bc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Per the [standard][1], bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, bc(1) attempts to recover from errors (see the **RESET**
@@ -25,19 +25,18 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "BC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "BC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH NAME
 .PP
 bc - arbitrary-precision decimal arithmetic language and calculator
 .SH SYNOPSIS
 .PP
-\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]\[en]global-stacks\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]mathlib\f[R]] [\f[B]\[en]no-prompt\f[R]]
-[\f[B]\[en]quiet\f[R]] [\f[B]\[en]standard\f[R]] [\f[B]\[en]warn\f[R]]
-[\f[B]\[en]version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]--global-stacks\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--mathlib\f[R]]
+[\f[B]--no-prompt\f[R]] [\f[B]--quiet\f[R]] [\f[B]--standard\f[R]]
+[\f[B]--warn\f[R]] [\f[B]--version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -58,7 +57,7 @@ This bc(1) is a drop-in replacement for \f[I]any\f[R] bc(1), including
 .PP
 The following are the options that bc(1) accepts.
 .PP
-\f[B]-g\f[R], \f[B]\[en]global-stacks\f[R]
+\f[B]-g\f[R], \f[B]--global-stacks\f[R]
 .IP
 .nf
 \f[C]
@@ -115,10 +114,10 @@ This is a **non-portable extension**.
 \f[R]
 .fi
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -126,7 +125,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-l\f[R], \f[B]\[en]mathlib\f[R]
+\f[B]-l\f[R], \f[B]--mathlib\f[R]
 Sets \f[B]scale\f[R] (see the \f[B]SYNTAX\f[R] section) to \f[B]20\f[R]
 and loads the included math library before running any code, including
 any expressions or files specified on the command line.
@@ -135,7 +134,7 @@ any expressions or files specified on the command line.
 To learn what is in the library, see the \f[B]LIBRARY\f[R] section.
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 Disables the prompt in TTY mode.
 (The prompt is only enabled in TTY mode.
 See the \f[B]TTY MODE\f[R] section) This is mostly for those users that
@@ -147,18 +146,18 @@ Most of those users would want to put this option in
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-q\f[R], \f[B]\[en]quiet\f[R]
+\f[B]-q\f[R], \f[B]--quiet\f[R]
 This option is for compatibility with the GNU
 bc(1) (https://www.gnu.org/software/bc/); it is a no-op.
 Without this option, GNU bc(1) prints a copyright header.
 This bc(1) only prints the copyright header if one or more of the
-\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]\[en]version\f[R] options are given.
+\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]--version\f[R] options are given.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-s\f[R], \f[B]\[en]standard\f[R]
+\f[B]-s\f[R], \f[B]--standard\f[R]
 Process exactly the language defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html)
 and error if any extensions are used.
@@ -167,15 +166,15 @@ and error if any extensions are used.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-w\f[R], \f[B]\[en]warn\f[R]
-Like \f[B]-s\f[R] and \f[B]\[en]standard\f[R], except that warnings (and
+\f[B]-w\f[R], \f[B]--warn\f[R]
+Like \f[B]-s\f[R] and \f[B]--standard\f[R], except that warnings (and
 not errors) are printed for non-standard extensions and execution
 continues normally.
 .RS
@@ -183,7 +182,7 @@ continues normally.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -192,26 +191,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]BC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -220,6 +229,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other bc(1) implementations, this bc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -271,8 +283,8 @@ constant numbers.
 It is the \[lq]input\[rq] base, or the number base used for interpreting
 input numbers.
 \f[B]ibase\f[R] is initially \f[B]10\f[R].
-If the \f[B]-s\f[R] (\f[B]\[en]standard\f[R]) and \f[B]-w\f[R]
-(\f[B]\[en]warn\f[R]) flags were not given on the command line, the max
+If the \f[B]-s\f[R] (\f[B]--standard\f[R]) and \f[B]-w\f[R]
+(\f[B]--warn\f[R]) flags were not given on the command line, the max
 allowable value for \f[B]ibase\f[R] is \f[B]36\f[R].
 Otherwise, it is \f[B]16\f[R].
 The min allowable value for \f[B]ibase\f[R] is \f[B]2\f[R].
@@ -432,7 +444,7 @@ The following arithmetic and logical operators can be used.
 They are listed in order of decreasing precedence.
 Operators in the same group have the same precedence.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 Type: Prefix and Postfix
 .RS
 .PP
@@ -515,7 +527,7 @@ Description: \f[B]boolean or\f[R]
 .PP
 The operators will be described in more detail below.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 The prefix and postfix \f[B]increment\f[R] and \f[B]decrement\f[R]
 operators behave exactly like they would in C.
 They require a named expression (see the \f[I]Named Expressions\f[R]
@@ -895,7 +907,7 @@ This is a \f[B]non-portable extension\f[R].
 .SH LIBRARY
 .PP
 All of the functions below are available when the \f[B]-l\f[R] or
-\f[B]\[en]mathlib\f[R] command-line flags are given.
+\f[B]--mathlib\f[R] command-line flags are given.
 .SS Standard Library
 .PP
 The
@@ -1200,11 +1212,11 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 bc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Per the
@@ -1212,7 +1224,7 @@ standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html),
 bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, bc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,8 +34,7 @@ bc - arbitrary-precision decimal arithmetic language and calculator

 # SYNOPSIS

-**bc** [**-ghilPqsvVw**] [**--global-stacks**] [**--help**] [**--interactive**] [**--mathlib**] [**--no-prompt**] [**--quiet**] [**--standard**] [**--warn**] [**--version**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...]
-[*file*...]
+**bc** [**-ghilPqsvVw**] [**-\-global-stacks**] [**-\-help**] [**-\-interactive**] [**-\-mathlib**] [**-\-no-prompt**] [**-\-quiet**] [**-\-standard**] [**-\-warn**] [**-\-version**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -54,7 +53,7 @@ especially) the GNU bc(1).

 The following are the options that bc(1) accepts.

-**-g**, **--global-stacks**
+**-g**, **-\-global-stacks**

    Turns the globals **ibase**, **obase**, and **scale** into stacks.

@@ -107,17 +106,17 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-l**, **--mathlib**
+**-l**, **-\-mathlib**

 :   Sets **scale** (see the **SYNTAX** section) to **20** and loads the included
    math library before running any code, including any expressions or files
@@ -125,7 +124,7 @@ The following are the options that bc(1) accepts.

    To learn what is in the library, see the **LIBRARY** section.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   Disables the prompt in TTY mode. (The prompt is only enabled in TTY mode.
    See the **TTY MODE** section) This is mostly for those users that do not
@@ -135,57 +134,64 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-q**, **--quiet**
+**-q**, **-\-quiet**

 :   This option is for compatibility with the [GNU bc(1)][2]; it is a no-op.
    Without this option, GNU bc(1) prints a copyright header. This bc(1) only
    prints the copyright header if one or more of the **-v**, **-V**, or
-    **--version** options are given.
+    **-\-version** options are given.

    This is a **non-portable extension**.

-**-s**, **--standard**
+**-s**, **-\-standard**

 :   Process exactly the language defined by the [standard][1] and error if any
    extensions are used.

    This is a **non-portable extension**.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

    This is a **non-portable extension**.

-**-w**, **--warn**
+**-w**, **-\-warn**

-:   Like **-s** and **--standard**, except that warnings (and not errors) are
+:   Like **-s** and **-\-standard**, except that warnings (and not errors) are
    printed for non-standard extensions and execution continues normally.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **BC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -193,7 +199,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other bc(1) implementations, this bc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -237,8 +245,8 @@ Identifiers with more than one character (letter) are a

 **ibase** is a global variable determining how to interpret constant numbers. It
 is the "input" base, or the number base used for interpreting input numbers.
-**ibase** is initially **10**. If the **-s** (**--standard**) and **-w**
-(**--warn**) flags were not given on the command line, the max allowable value
+**ibase** is initially **10**. If the **-s** (**-\-standard**) and **-w**
+(**-\-warn**) flags were not given on the command line, the max allowable value
 for **ibase** is **36**. Otherwise, it is **16**. The min allowable value for
 **ibase** is **2**. The max allowable value for **ibase** can be queried in
 bc(1) programs with the **maxibase()** built-in function.
@@ -357,7 +365,7 @@ The following arithmetic and logical operators can be used. They are listed in
 order of decreasing precedence. Operators in the same group have the same
 precedence.

-**++** **--**
+**++** **-\-**

 :   Type: Prefix and Postfix

@@ -431,7 +439,7 @@ precedence.

 The operators will be described in more detail below.

-**++** **--**
+**++** **-\-**

 :   The prefix and postfix **increment** and **decrement** operators behave
    exactly like they would in C. They require a named expression (see the
@@ -707,7 +715,7 @@ This is a **non-portable extension**.

 # LIBRARY

-All of the functions below  are available when the **-l** or **--mathlib**
+All of the functions below  are available when the **-l** or **-\-mathlib**
 command-line flags are given.

 ## Standard Library
@@ -983,17 +991,17 @@ The other statuses will only be returned when bc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since bc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Per the [standard][1], bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, bc(1) attempts to recover from errors (see the **RESET**
@@ -25,19 +25,18 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "BC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "BC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH NAME
 .PP
 bc - arbitrary-precision decimal arithmetic language and calculator
 .SH SYNOPSIS
 .PP
-\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]\[en]global-stacks\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]mathlib\f[R]] [\f[B]\[en]no-prompt\f[R]]
-[\f[B]\[en]quiet\f[R]] [\f[B]\[en]standard\f[R]] [\f[B]\[en]warn\f[R]]
-[\f[B]\[en]version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]--global-stacks\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--mathlib\f[R]]
+[\f[B]--no-prompt\f[R]] [\f[B]--quiet\f[R]] [\f[B]--standard\f[R]]
+[\f[B]--warn\f[R]] [\f[B]--version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -58,7 +57,7 @@ This bc(1) is a drop-in replacement for \f[I]any\f[R] bc(1), including
 .PP
 The following are the options that bc(1) accepts.
 .PP
-\f[B]-g\f[R], \f[B]\[en]global-stacks\f[R]
+\f[B]-g\f[R], \f[B]--global-stacks\f[R]
 .IP
 .nf
 \f[C]
@@ -115,10 +114,10 @@ This is a **non-portable extension**.
 \f[R]
 .fi
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -126,7 +125,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-l\f[R], \f[B]\[en]mathlib\f[R]
+\f[B]-l\f[R], \f[B]--mathlib\f[R]
 Sets \f[B]scale\f[R] (see the \f[B]SYNTAX\f[R] section) to \f[B]20\f[R]
 and loads the included math library before running any code, including
 any expressions or files specified on the command line.
@@ -135,25 +134,25 @@ any expressions or files specified on the command line.
 To learn what is in the library, see the \f[B]LIBRARY\f[R] section.
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 This option is a no-op.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-q\f[R], \f[B]\[en]quiet\f[R]
+\f[B]-q\f[R], \f[B]--quiet\f[R]
 This option is for compatibility with the GNU
 bc(1) (https://www.gnu.org/software/bc/); it is a no-op.
 Without this option, GNU bc(1) prints a copyright header.
 This bc(1) only prints the copyright header if one or more of the
-\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]\[en]version\f[R] options are given.
+\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]--version\f[R] options are given.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-s\f[R], \f[B]\[en]standard\f[R]
+\f[B]-s\f[R], \f[B]--standard\f[R]
 Process exactly the language defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html)
 and error if any extensions are used.
@@ -162,15 +161,15 @@ and error if any extensions are used.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-w\f[R], \f[B]\[en]warn\f[R]
-Like \f[B]-s\f[R] and \f[B]\[en]standard\f[R], except that warnings (and
+\f[B]-w\f[R], \f[B]--warn\f[R]
+Like \f[B]-s\f[R] and \f[B]--standard\f[R], except that warnings (and
 not errors) are printed for non-standard extensions and execution
 continues normally.
 .RS
@@ -178,7 +177,7 @@ continues normally.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -187,26 +186,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]BC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -215,6 +224,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other bc(1) implementations, this bc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -266,8 +278,8 @@ constant numbers.
 It is the \[lq]input\[rq] base, or the number base used for interpreting
 input numbers.
 \f[B]ibase\f[R] is initially \f[B]10\f[R].
-If the \f[B]-s\f[R] (\f[B]\[en]standard\f[R]) and \f[B]-w\f[R]
-(\f[B]\[en]warn\f[R]) flags were not given on the command line, the max
+If the \f[B]-s\f[R] (\f[B]--standard\f[R]) and \f[B]-w\f[R]
+(\f[B]--warn\f[R]) flags were not given on the command line, the max
 allowable value for \f[B]ibase\f[R] is \f[B]36\f[R].
 Otherwise, it is \f[B]16\f[R].
 The min allowable value for \f[B]ibase\f[R] is \f[B]2\f[R].
@@ -427,7 +439,7 @@ The following arithmetic and logical operators can be used.
 They are listed in order of decreasing precedence.
 Operators in the same group have the same precedence.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 Type: Prefix and Postfix
 .RS
 .PP
@@ -510,7 +522,7 @@ Description: \f[B]boolean or\f[R]
 .PP
 The operators will be described in more detail below.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 The prefix and postfix \f[B]increment\f[R] and \f[B]decrement\f[R]
 operators behave exactly like they would in C.
 They require a named expression (see the \f[I]Named Expressions\f[R]
@@ -890,7 +902,7 @@ This is a \f[B]non-portable extension\f[R].
 .SH LIBRARY
 .PP
 All of the functions below are available when the \f[B]-l\f[R] or
-\f[B]\[en]mathlib\f[R] command-line flags are given.
+\f[B]--mathlib\f[R] command-line flags are given.
 .SS Standard Library
 .PP
 The
@@ -1195,11 +1207,11 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 bc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Per the
@@ -1207,7 +1219,7 @@ standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html),
 bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, bc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,8 +34,7 @@ bc - arbitrary-precision decimal arithmetic language and calculator

 # SYNOPSIS

-**bc** [**-ghilPqsvVw**] [**--global-stacks**] [**--help**] [**--interactive**] [**--mathlib**] [**--no-prompt**] [**--quiet**] [**--standard**] [**--warn**] [**--version**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...]
-[*file*...]
+**bc** [**-ghilPqsvVw**] [**-\-global-stacks**] [**-\-help**] [**-\-interactive**] [**-\-mathlib**] [**-\-no-prompt**] [**-\-quiet**] [**-\-standard**] [**-\-warn**] [**-\-version**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -54,7 +53,7 @@ especially) the GNU bc(1).

 The following are the options that bc(1) accepts.

-**-g**, **--global-stacks**
+**-g**, **-\-global-stacks**

    Turns the globals **ibase**, **obase**, and **scale** into stacks.

@@ -107,17 +106,17 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-l**, **--mathlib**
+**-l**, **-\-mathlib**

 :   Sets **scale** (see the **SYNTAX** section) to **20** and loads the included
    math library before running any code, including any expressions or files
@@ -125,63 +124,70 @@ The following are the options that bc(1) accepts.

    To learn what is in the library, see the **LIBRARY** section.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   This option is a no-op.

    This is a **non-portable extension**.

-**-q**, **--quiet**
+**-q**, **-\-quiet**

 :   This option is for compatibility with the [GNU bc(1)][2]; it is a no-op.
    Without this option, GNU bc(1) prints a copyright header. This bc(1) only
    prints the copyright header if one or more of the **-v**, **-V**, or
-    **--version** options are given.
+    **-\-version** options are given.

    This is a **non-portable extension**.

-**-s**, **--standard**
+**-s**, **-\-standard**

 :   Process exactly the language defined by the [standard][1] and error if any
    extensions are used.

    This is a **non-portable extension**.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

    This is a **non-portable extension**.

-**-w**, **--warn**
+**-w**, **-\-warn**

-:   Like **-s** and **--standard**, except that warnings (and not errors) are
+:   Like **-s** and **-\-standard**, except that warnings (and not errors) are
    printed for non-standard extensions and execution continues normally.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **BC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -189,7 +195,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other bc(1) implementations, this bc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -233,8 +241,8 @@ Identifiers with more than one character (letter) are a

 **ibase** is a global variable determining how to interpret constant numbers. It
 is the "input" base, or the number base used for interpreting input numbers.
-**ibase** is initially **10**. If the **-s** (**--standard**) and **-w**
-(**--warn**) flags were not given on the command line, the max allowable value
+**ibase** is initially **10**. If the **-s** (**-\-standard**) and **-w**
+(**-\-warn**) flags were not given on the command line, the max allowable value
 for **ibase** is **36**. Otherwise, it is **16**. The min allowable value for
 **ibase** is **2**. The max allowable value for **ibase** can be queried in
 bc(1) programs with the **maxibase()** built-in function.
@@ -353,7 +361,7 @@ The following arithmetic and logical operators can be used. They are listed in
 order of decreasing precedence. Operators in the same group have the same
 precedence.

-**++** **--**
+**++** **-\-**

 :   Type: Prefix and Postfix

@@ -427,7 +435,7 @@ precedence.

 The operators will be described in more detail below.

-**++** **--**
+**++** **-\-**

 :   The prefix and postfix **increment** and **decrement** operators behave
    exactly like they would in C. They require a named expression (see the
@@ -703,7 +711,7 @@ This is a **non-portable extension**.

 # LIBRARY

-All of the functions below  are available when the **-l** or **--mathlib**
+All of the functions below  are available when the **-l** or **-\-mathlib**
 command-line flags are given.

 ## Standard Library
@@ -979,17 +987,17 @@ The other statuses will only be returned when bc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since bc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Per the [standard][1], bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, bc(1) attempts to recover from errors (see the **RESET**
@@ -25,19 +25,18 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "BC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "BC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH NAME
 .PP
 bc - arbitrary-precision decimal arithmetic language and calculator
 .SH SYNOPSIS
 .PP
-\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]\[en]global-stacks\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]mathlib\f[R]] [\f[B]\[en]no-prompt\f[R]]
-[\f[B]\[en]quiet\f[R]] [\f[B]\[en]standard\f[R]] [\f[B]\[en]warn\f[R]]
-[\f[B]\[en]version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]--global-stacks\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--mathlib\f[R]]
+[\f[B]--no-prompt\f[R]] [\f[B]--quiet\f[R]] [\f[B]--standard\f[R]]
+[\f[B]--warn\f[R]] [\f[B]--version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -58,7 +57,7 @@ This bc(1) is a drop-in replacement for \f[I]any\f[R] bc(1), including
 .PP
 The following are the options that bc(1) accepts.
 .PP
-\f[B]-g\f[R], \f[B]\[en]global-stacks\f[R]
+\f[B]-g\f[R], \f[B]--global-stacks\f[R]
 .IP
 .nf
 \f[C]
@@ -115,10 +114,10 @@ This is a **non-portable extension**.
 \f[R]
 .fi
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -126,7 +125,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-l\f[R], \f[B]\[en]mathlib\f[R]
+\f[B]-l\f[R], \f[B]--mathlib\f[R]
 Sets \f[B]scale\f[R] (see the \f[B]SYNTAX\f[R] section) to \f[B]20\f[R]
 and loads the included math library before running any code, including
 any expressions or files specified on the command line.
@@ -135,25 +134,25 @@ any expressions or files specified on the command line.
 To learn what is in the library, see the \f[B]LIBRARY\f[R] section.
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 This option is a no-op.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-q\f[R], \f[B]\[en]quiet\f[R]
+\f[B]-q\f[R], \f[B]--quiet\f[R]
 This option is for compatibility with the GNU
 bc(1) (https://www.gnu.org/software/bc/); it is a no-op.
 Without this option, GNU bc(1) prints a copyright header.
 This bc(1) only prints the copyright header if one or more of the
-\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]\[en]version\f[R] options are given.
+\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]--version\f[R] options are given.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-s\f[R], \f[B]\[en]standard\f[R]
+\f[B]-s\f[R], \f[B]--standard\f[R]
 Process exactly the language defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html)
 and error if any extensions are used.
@@ -162,15 +161,15 @@ and error if any extensions are used.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-w\f[R], \f[B]\[en]warn\f[R]
-Like \f[B]-s\f[R] and \f[B]\[en]standard\f[R], except that warnings (and
+\f[B]-w\f[R], \f[B]--warn\f[R]
+Like \f[B]-s\f[R] and \f[B]--standard\f[R], except that warnings (and
 not errors) are printed for non-standard extensions and execution
 continues normally.
 .RS
@@ -178,7 +177,7 @@ continues normally.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -187,26 +186,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]BC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -215,6 +224,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other bc(1) implementations, this bc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -266,8 +278,8 @@ constant numbers.
 It is the \[lq]input\[rq] base, or the number base used for interpreting
 input numbers.
 \f[B]ibase\f[R] is initially \f[B]10\f[R].
-If the \f[B]-s\f[R] (\f[B]\[en]standard\f[R]) and \f[B]-w\f[R]
-(\f[B]\[en]warn\f[R]) flags were not given on the command line, the max
+If the \f[B]-s\f[R] (\f[B]--standard\f[R]) and \f[B]-w\f[R]
+(\f[B]--warn\f[R]) flags were not given on the command line, the max
 allowable value for \f[B]ibase\f[R] is \f[B]36\f[R].
 Otherwise, it is \f[B]16\f[R].
 The min allowable value for \f[B]ibase\f[R] is \f[B]2\f[R].
@@ -427,7 +439,7 @@ The following arithmetic and logical operators can be used.
 They are listed in order of decreasing precedence.
 Operators in the same group have the same precedence.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 Type: Prefix and Postfix
 .RS
 .PP
@@ -510,7 +522,7 @@ Description: \f[B]boolean or\f[R]
 .PP
 The operators will be described in more detail below.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 The prefix and postfix \f[B]increment\f[R] and \f[B]decrement\f[R]
 operators behave exactly like they would in C.
 They require a named expression (see the \f[I]Named Expressions\f[R]
@@ -890,7 +902,7 @@ This is a \f[B]non-portable extension\f[R].
 .SH LIBRARY
 .PP
 All of the functions below are available when the \f[B]-l\f[R] or
-\f[B]\[en]mathlib\f[R] command-line flags are given.
+\f[B]--mathlib\f[R] command-line flags are given.
 .SS Standard Library
 .PP
 The
@@ -1195,11 +1207,11 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 bc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Per the
@@ -1207,7 +1219,7 @@ standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html),
 bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, bc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,8 +34,7 @@ bc - arbitrary-precision decimal arithmetic language and calculator

 # SYNOPSIS

-**bc** [**-ghilPqsvVw**] [**--global-stacks**] [**--help**] [**--interactive**] [**--mathlib**] [**--no-prompt**] [**--quiet**] [**--standard**] [**--warn**] [**--version**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...]
-[*file*...]
+**bc** [**-ghilPqsvVw**] [**-\-global-stacks**] [**-\-help**] [**-\-interactive**] [**-\-mathlib**] [**-\-no-prompt**] [**-\-quiet**] [**-\-standard**] [**-\-warn**] [**-\-version**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -54,7 +53,7 @@ especially) the GNU bc(1).

 The following are the options that bc(1) accepts.

-**-g**, **--global-stacks**
+**-g**, **-\-global-stacks**

    Turns the globals **ibase**, **obase**, and **scale** into stacks.

@@ -107,17 +106,17 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-l**, **--mathlib**
+**-l**, **-\-mathlib**

 :   Sets **scale** (see the **SYNTAX** section) to **20** and loads the included
    math library before running any code, including any expressions or files
@@ -125,63 +124,70 @@ The following are the options that bc(1) accepts.

    To learn what is in the library, see the **LIBRARY** section.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   This option is a no-op.

    This is a **non-portable extension**.

-**-q**, **--quiet**
+**-q**, **-\-quiet**

 :   This option is for compatibility with the [GNU bc(1)][2]; it is a no-op.
    Without this option, GNU bc(1) prints a copyright header. This bc(1) only
    prints the copyright header if one or more of the **-v**, **-V**, or
-    **--version** options are given.
+    **-\-version** options are given.

    This is a **non-portable extension**.

-**-s**, **--standard**
+**-s**, **-\-standard**

 :   Process exactly the language defined by the [standard][1] and error if any
    extensions are used.

    This is a **non-portable extension**.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

    This is a **non-portable extension**.

-**-w**, **--warn**
+**-w**, **-\-warn**

-:   Like **-s** and **--standard**, except that warnings (and not errors) are
+:   Like **-s** and **-\-standard**, except that warnings (and not errors) are
    printed for non-standard extensions and execution continues normally.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **BC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -189,7 +195,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other bc(1) implementations, this bc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -233,8 +241,8 @@ Identifiers with more than one character (letter) are a

 **ibase** is a global variable determining how to interpret constant numbers. It
 is the "input" base, or the number base used for interpreting input numbers.
-**ibase** is initially **10**. If the **-s** (**--standard**) and **-w**
-(**--warn**) flags were not given on the command line, the max allowable value
+**ibase** is initially **10**. If the **-s** (**-\-standard**) and **-w**
+(**-\-warn**) flags were not given on the command line, the max allowable value
 for **ibase** is **36**. Otherwise, it is **16**. The min allowable value for
 **ibase** is **2**. The max allowable value for **ibase** can be queried in
 bc(1) programs with the **maxibase()** built-in function.
@@ -353,7 +361,7 @@ The following arithmetic and logical operators can be used. They are listed in
 order of decreasing precedence. Operators in the same group have the same
 precedence.

-**++** **--**
+**++** **-\-**

 :   Type: Prefix and Postfix

@@ -427,7 +435,7 @@ precedence.

 The operators will be described in more detail below.

-**++** **--**
+**++** **-\-**

 :   The prefix and postfix **increment** and **decrement** operators behave
    exactly like they would in C. They require a named expression (see the
@@ -703,7 +711,7 @@ This is a **non-portable extension**.

 # LIBRARY

-All of the functions below  are available when the **-l** or **--mathlib**
+All of the functions below  are available when the **-l** or **-\-mathlib**
 command-line flags are given.

 ## Standard Library
@@ -979,17 +987,17 @@ The other statuses will only be returned when bc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since bc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Per the [standard][1], bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, bc(1) attempts to recover from errors (see the **RESET**
@@ -25,19 +25,18 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "BC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "BC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH NAME
 .PP
 bc - arbitrary-precision decimal arithmetic language and calculator
 .SH SYNOPSIS
 .PP
-\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]\[en]global-stacks\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]mathlib\f[R]] [\f[B]\[en]no-prompt\f[R]]
-[\f[B]\[en]quiet\f[R]] [\f[B]\[en]standard\f[R]] [\f[B]\[en]warn\f[R]]
-[\f[B]\[en]version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]--global-stacks\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--mathlib\f[R]]
+[\f[B]--no-prompt\f[R]] [\f[B]--quiet\f[R]] [\f[B]--standard\f[R]]
+[\f[B]--warn\f[R]] [\f[B]--version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -55,7 +54,7 @@ the command line and executes them before reading from \f[B]stdin\f[R].
 .PP
 The following are the options that bc(1) accepts.
 .TP
-\f[B]-g\f[R], \f[B]\[en]global-stacks\f[R]
+\f[B]-g\f[R], \f[B]--global-stacks\f[R]
 Turns the globals \f[B]ibase\f[R], \f[B]obase\f[R], \f[B]scale\f[R], and
 \f[B]seed\f[R] into stacks.
 .RS
@@ -147,10 +146,10 @@ is ignored.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -158,7 +157,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-l\f[R], \f[B]\[en]mathlib\f[R]
+\f[B]-l\f[R], \f[B]--mathlib\f[R]
 Sets \f[B]scale\f[R] (see the \f[B]SYNTAX\f[R] section) to \f[B]20\f[R]
 and loads the included math library and the extended math library before
 running any code, including any expressions or files specified on the
@@ -168,7 +167,7 @@ command line.
 To learn what is in the libraries, see the \f[B]LIBRARY\f[R] section.
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 Disables the prompt in TTY mode.
 (The prompt is only enabled in TTY mode.
 See the \f[B]TTY MODE\f[R] section) This is mostly for those users that
@@ -180,18 +179,18 @@ Most of those users would want to put this option in
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-q\f[R], \f[B]\[en]quiet\f[R]
+\f[B]-q\f[R], \f[B]--quiet\f[R]
 This option is for compatibility with the GNU
 bc(1) (https://www.gnu.org/software/bc/); it is a no-op.
 Without this option, GNU bc(1) prints a copyright header.
 This bc(1) only prints the copyright header if one or more of the
-\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]\[en]version\f[R] options are given.
+\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]--version\f[R] options are given.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-s\f[R], \f[B]\[en]standard\f[R]
+\f[B]-s\f[R], \f[B]--standard\f[R]
 Process exactly the language defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html)
 and error if any extensions are used.
@@ -200,15 +199,15 @@ and error if any extensions are used.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-w\f[R], \f[B]\[en]warn\f[R]
-Like \f[B]-s\f[R] and \f[B]\[en]standard\f[R], except that warnings (and
+\f[B]-w\f[R], \f[B]--warn\f[R]
+Like \f[B]-s\f[R] and \f[B]--standard\f[R], except that warnings (and
 not errors) are printed for non-standard extensions and execution
 continues normally.
 .RS
@@ -216,7 +215,7 @@ continues normally.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -225,26 +224,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]BC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -253,6 +262,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other bc(1) implementations, this bc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -304,8 +316,8 @@ constant numbers.
 It is the \[lq]input\[rq] base, or the number base used for interpreting
 input numbers.
 \f[B]ibase\f[R] is initially \f[B]10\f[R].
-If the \f[B]-s\f[R] (\f[B]\[en]standard\f[R]) and \f[B]-w\f[R]
-(\f[B]\[en]warn\f[R]) flags were not given on the command line, the max
+If the \f[B]-s\f[R] (\f[B]--standard\f[R]) and \f[B]-w\f[R]
+(\f[B]--warn\f[R]) flags were not given on the command line, the max
 allowable value for \f[B]ibase\f[R] is \f[B]36\f[R].
 Otherwise, it is \f[B]16\f[R].
 The min allowable value for \f[B]ibase\f[R] is \f[B]2\f[R].
@@ -564,7 +576,7 @@ The following arithmetic and logical operators can be used.
 They are listed in order of decreasing precedence.
 Operators in the same group have the same precedence.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 Type: Prefix and Postfix
 .RS
 .PP
@@ -674,7 +686,7 @@ Description: \f[B]boolean or\f[R]
 .PP
 The operators will be described in more detail below.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 The prefix and postfix \f[B]increment\f[R] and \f[B]decrement\f[R]
 operators behave exactly like they would in C.
 They require a named expression (see the \f[I]Named Expressions\f[R]
@@ -1120,7 +1132,7 @@ This is a \f[B]non-portable extension\f[R].
 .PP
 All of the functions below, including the functions in the extended math
 library (see the \f[I]Extended Library\f[R] subsection below), are
-available when the \f[B]-l\f[R] or \f[B]\[en]mathlib\f[R] command-line
+available when the \f[B]-l\f[R] or \f[B]--mathlib\f[R] command-line
 flags are given, except that the extended math library is not available
 when the \f[B]-s\f[R] option, the \f[B]-w\f[R] option, or equivalents
 are given.
@@ -1181,7 +1193,7 @@ Functions\f[R] subsection below).
 .SS Extended Library
 .PP
 The extended library is \f[I]not\f[R] loaded when the
-\f[B]-s\f[R]/\f[B]\[en]standard\f[R] or \f[B]-w\f[R]/\f[B]\[en]warn\f[R]
+\f[B]-s\f[R]/\f[B]--standard\f[R] or \f[B]-w\f[R]/\f[B]--warn\f[R]
 options are given since they are not part of the library defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html).
 .PP
@@ -1939,11 +1951,11 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 bc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Per the
@@ -1951,7 +1963,7 @@ standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html),
 bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, bc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,8 +34,7 @@ bc - arbitrary-precision decimal arithmetic language and calculator

 # SYNOPSIS

-**bc** [**-ghilPqsvVw**] [**--global-stacks**] [**--help**] [**--interactive**] [**--mathlib**] [**--no-prompt**] [**--quiet**] [**--standard**] [**--warn**] [**--version**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...]
-[*file*...]
+**bc** [**-ghilPqsvVw**] [**-\-global-stacks**] [**-\-help**] [**-\-interactive**] [**-\-mathlib**] [**-\-no-prompt**] [**-\-quiet**] [**-\-standard**] [**-\-warn**] [**-\-version**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -51,7 +50,7 @@ command line and executes them before reading from **stdin**.

 The following are the options that bc(1) accepts.

-**-g**, **--global-stacks**
+**-g**, **-\-global-stacks**

 :   Turns the globals **ibase**, **obase**, **scale**, and **seed** into stacks.

@@ -119,17 +118,17 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-l**, **--mathlib**
+**-l**, **-\-mathlib**

 :   Sets **scale** (see the **SYNTAX** section) to **20** and loads the included
    math library and the extended math library before running any code,
@@ -137,7 +136,7 @@ The following are the options that bc(1) accepts.

    To learn what is in the libraries, see the **LIBRARY** section.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   Disables the prompt in TTY mode. (The prompt is only enabled in TTY mode.
    See the **TTY MODE** section) This is mostly for those users that do not
@@ -147,57 +146,64 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-q**, **--quiet**
+**-q**, **-\-quiet**

 :   This option is for compatibility with the [GNU bc(1)][2]; it is a no-op.
    Without this option, GNU bc(1) prints a copyright header. This bc(1) only
    prints the copyright header if one or more of the **-v**, **-V**, or
-    **--version** options are given.
+    **-\-version** options are given.

    This is a **non-portable extension**.

-**-s**, **--standard**
+**-s**, **-\-standard**

 :   Process exactly the language defined by the [standard][1] and error if any
    extensions are used.

    This is a **non-portable extension**.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

    This is a **non-portable extension**.

-**-w**, **--warn**
+**-w**, **-\-warn**

-:   Like **-s** and **--standard**, except that warnings (and not errors) are
+:   Like **-s** and **-\-standard**, except that warnings (and not errors) are
    printed for non-standard extensions and execution continues normally.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **BC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -205,7 +211,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other bc(1) implementations, this bc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -249,8 +257,8 @@ Identifiers with more than one character (letter) are a

 **ibase** is a global variable determining how to interpret constant numbers. It
 is the "input" base, or the number base used for interpreting input numbers.
-**ibase** is initially **10**. If the **-s** (**--standard**) and **-w**
-(**--warn**) flags were not given on the command line, the max allowable value
+**ibase** is initially **10**. If the **-s** (**-\-standard**) and **-w**
+(**-\-warn**) flags were not given on the command line, the max allowable value
 for **ibase** is **36**. Otherwise, it is **16**. The min allowable value for
 **ibase** is **2**. The max allowable value for **ibase** can be queried in
 bc(1) programs with the **maxibase()** built-in function.
@@ -440,7 +448,7 @@ The following arithmetic and logical operators can be used. They are listed in
 order of decreasing precedence. Operators in the same group have the same
 precedence.

-**++** **--**
+**++** **-\-**

 :   Type: Prefix and Postfix

@@ -538,7 +546,7 @@ precedence.

 The operators will be described in more detail below.

-**++** **--**
+**++** **-\-**

 :   The prefix and postfix **increment** and **decrement** operators behave
    exactly like they would in C. They require a named expression (see the
@@ -869,7 +877,7 @@ This is a **non-portable extension**.

 All of the functions below, including the functions in the extended math
 library (see the *Extended Library* subsection below), are available when the
-**-l** or **--mathlib** command-line flags are given, except that the extended
+**-l** or **-\-mathlib** command-line flags are given, except that the extended
 math library is not available when the **-s** option, the **-w** option, or
 equivalents are given.

@@ -921,8 +929,8 @@ The [standard][1] defines the following functions for the math library:

 ## Extended Library

-The extended library is *not* loaded when the **-s**/**--standard** or
-**-w**/**--warn** options are given since they are not part of the library
+The extended library is *not* loaded when the **-s**/**-\-standard** or
+**-w**/**-\-warn** options are given since they are not part of the library
 defined by the [standard][1].

 The extended library is a **non-portable extension**.
@@ -1590,17 +1598,17 @@ The other statuses will only be returned when bc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since bc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Per the [standard][1], bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, bc(1) attempts to recover from errors (see the **RESET**
@@ -25,19 +25,18 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "BC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "BC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH NAME
 .PP
 bc - arbitrary-precision decimal arithmetic language and calculator
 .SH SYNOPSIS
 .PP
-\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]\[en]global-stacks\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]mathlib\f[R]] [\f[B]\[en]no-prompt\f[R]]
-[\f[B]\[en]quiet\f[R]] [\f[B]\[en]standard\f[R]] [\f[B]\[en]warn\f[R]]
-[\f[B]\[en]version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]--global-stacks\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--mathlib\f[R]]
+[\f[B]--no-prompt\f[R]] [\f[B]--quiet\f[R]] [\f[B]--standard\f[R]]
+[\f[B]--warn\f[R]] [\f[B]--version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -55,7 +54,7 @@ the command line and executes them before reading from \f[B]stdin\f[R].
 .PP
 The following are the options that bc(1) accepts.
 .TP
-\f[B]-g\f[R], \f[B]\[en]global-stacks\f[R]
+\f[B]-g\f[R], \f[B]--global-stacks\f[R]
 Turns the globals \f[B]ibase\f[R], \f[B]obase\f[R], \f[B]scale\f[R], and
 \f[B]seed\f[R] into stacks.
 .RS
@@ -147,10 +146,10 @@ is ignored.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -158,7 +157,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-l\f[R], \f[B]\[en]mathlib\f[R]
+\f[B]-l\f[R], \f[B]--mathlib\f[R]
 Sets \f[B]scale\f[R] (see the \f[B]SYNTAX\f[R] section) to \f[B]20\f[R]
 and loads the included math library and the extended math library before
 running any code, including any expressions or files specified on the
@@ -168,7 +167,7 @@ command line.
 To learn what is in the libraries, see the \f[B]LIBRARY\f[R] section.
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 Disables the prompt in TTY mode.
 (The prompt is only enabled in TTY mode.
 See the \f[B]TTY MODE\f[R] section) This is mostly for those users that
@@ -180,18 +179,18 @@ Most of those users would want to put this option in
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-q\f[R], \f[B]\[en]quiet\f[R]
+\f[B]-q\f[R], \f[B]--quiet\f[R]
 This option is for compatibility with the GNU
 bc(1) (https://www.gnu.org/software/bc/); it is a no-op.
 Without this option, GNU bc(1) prints a copyright header.
 This bc(1) only prints the copyright header if one or more of the
-\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]\[en]version\f[R] options are given.
+\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]--version\f[R] options are given.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-s\f[R], \f[B]\[en]standard\f[R]
+\f[B]-s\f[R], \f[B]--standard\f[R]
 Process exactly the language defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html)
 and error if any extensions are used.
@@ -200,15 +199,15 @@ and error if any extensions are used.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-w\f[R], \f[B]\[en]warn\f[R]
-Like \f[B]-s\f[R] and \f[B]\[en]standard\f[R], except that warnings (and
+\f[B]-w\f[R], \f[B]--warn\f[R]
+Like \f[B]-s\f[R] and \f[B]--standard\f[R], except that warnings (and
 not errors) are printed for non-standard extensions and execution
 continues normally.
 .RS
@@ -216,7 +215,7 @@ continues normally.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -225,26 +224,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]BC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -253,6 +262,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other bc(1) implementations, this bc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -304,8 +316,8 @@ constant numbers.
 It is the \[lq]input\[rq] base, or the number base used for interpreting
 input numbers.
 \f[B]ibase\f[R] is initially \f[B]10\f[R].
-If the \f[B]-s\f[R] (\f[B]\[en]standard\f[R]) and \f[B]-w\f[R]
-(\f[B]\[en]warn\f[R]) flags were not given on the command line, the max
+If the \f[B]-s\f[R] (\f[B]--standard\f[R]) and \f[B]-w\f[R]
+(\f[B]--warn\f[R]) flags were not given on the command line, the max
 allowable value for \f[B]ibase\f[R] is \f[B]36\f[R].
 Otherwise, it is \f[B]16\f[R].
 The min allowable value for \f[B]ibase\f[R] is \f[B]2\f[R].
@@ -564,7 +576,7 @@ The following arithmetic and logical operators can be used.
 They are listed in order of decreasing precedence.
 Operators in the same group have the same precedence.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 Type: Prefix and Postfix
 .RS
 .PP
@@ -674,7 +686,7 @@ Description: \f[B]boolean or\f[R]
 .PP
 The operators will be described in more detail below.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 The prefix and postfix \f[B]increment\f[R] and \f[B]decrement\f[R]
 operators behave exactly like they would in C.
 They require a named expression (see the \f[I]Named Expressions\f[R]
@@ -1120,7 +1132,7 @@ This is a \f[B]non-portable extension\f[R].
 .PP
 All of the functions below, including the functions in the extended math
 library (see the \f[I]Extended Library\f[R] subsection below), are
-available when the \f[B]-l\f[R] or \f[B]\[en]mathlib\f[R] command-line
+available when the \f[B]-l\f[R] or \f[B]--mathlib\f[R] command-line
 flags are given, except that the extended math library is not available
 when the \f[B]-s\f[R] option, the \f[B]-w\f[R] option, or equivalents
 are given.
@@ -1181,7 +1193,7 @@ Functions\f[R] subsection below).
 .SS Extended Library
 .PP
 The extended library is \f[I]not\f[R] loaded when the
-\f[B]-s\f[R]/\f[B]\[en]standard\f[R] or \f[B]-w\f[R]/\f[B]\[en]warn\f[R]
+\f[B]-s\f[R]/\f[B]--standard\f[R] or \f[B]-w\f[R]/\f[B]--warn\f[R]
 options are given since they are not part of the library defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html).
 .PP
@@ -1939,11 +1951,11 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 bc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Per the
@@ -1951,7 +1963,7 @@ standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html),
 bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, bc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,8 +34,7 @@ bc - arbitrary-precision decimal arithmetic language and calculator

 # SYNOPSIS

-**bc** [**-ghilPqsvVw**] [**--global-stacks**] [**--help**] [**--interactive**] [**--mathlib**] [**--no-prompt**] [**--quiet**] [**--standard**] [**--warn**] [**--version**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...]
-[*file*...]
+**bc** [**-ghilPqsvVw**] [**-\-global-stacks**] [**-\-help**] [**-\-interactive**] [**-\-mathlib**] [**-\-no-prompt**] [**-\-quiet**] [**-\-standard**] [**-\-warn**] [**-\-version**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -51,7 +50,7 @@ command line and executes them before reading from **stdin**.

 The following are the options that bc(1) accepts.

-**-g**, **--global-stacks**
+**-g**, **-\-global-stacks**

 :   Turns the globals **ibase**, **obase**, **scale**, and **seed** into stacks.

@@ -119,17 +118,17 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-l**, **--mathlib**
+**-l**, **-\-mathlib**

 :   Sets **scale** (see the **SYNTAX** section) to **20** and loads the included
    math library and the extended math library before running any code,
@@ -137,7 +136,7 @@ The following are the options that bc(1) accepts.

    To learn what is in the libraries, see the **LIBRARY** section.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   Disables the prompt in TTY mode. (The prompt is only enabled in TTY mode.
    See the **TTY MODE** section) This is mostly for those users that do not
@@ -147,57 +146,64 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-q**, **--quiet**
+**-q**, **-\-quiet**

 :   This option is for compatibility with the [GNU bc(1)][2]; it is a no-op.
    Without this option, GNU bc(1) prints a copyright header. This bc(1) only
    prints the copyright header if one or more of the **-v**, **-V**, or
-    **--version** options are given.
+    **-\-version** options are given.

    This is a **non-portable extension**.

-**-s**, **--standard**
+**-s**, **-\-standard**

 :   Process exactly the language defined by the [standard][1] and error if any
    extensions are used.

    This is a **non-portable extension**.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

    This is a **non-portable extension**.

-**-w**, **--warn**
+**-w**, **-\-warn**

-:   Like **-s** and **--standard**, except that warnings (and not errors) are
+:   Like **-s** and **-\-standard**, except that warnings (and not errors) are
    printed for non-standard extensions and execution continues normally.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **BC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -205,7 +211,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other bc(1) implementations, this bc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -249,8 +257,8 @@ Identifiers with more than one character (letter) are a

 **ibase** is a global variable determining how to interpret constant numbers. It
 is the "input" base, or the number base used for interpreting input numbers.
-**ibase** is initially **10**. If the **-s** (**--standard**) and **-w**
-(**--warn**) flags were not given on the command line, the max allowable value
+**ibase** is initially **10**. If the **-s** (**-\-standard**) and **-w**
+(**-\-warn**) flags were not given on the command line, the max allowable value
 for **ibase** is **36**. Otherwise, it is **16**. The min allowable value for
 **ibase** is **2**. The max allowable value for **ibase** can be queried in
 bc(1) programs with the **maxibase()** built-in function.
@@ -440,7 +448,7 @@ The following arithmetic and logical operators can be used. They are listed in
 order of decreasing precedence. Operators in the same group have the same
 precedence.

-**++** **--**
+**++** **-\-**

 :   Type: Prefix and Postfix

@@ -538,7 +546,7 @@ precedence.

 The operators will be described in more detail below.

-**++** **--**
+**++** **-\-**

 :   The prefix and postfix **increment** and **decrement** operators behave
    exactly like they would in C. They require a named expression (see the
@@ -869,7 +877,7 @@ This is a **non-portable extension**.

 All of the functions below, including the functions in the extended math
 library (see the *Extended Library* subsection below), are available when the
-**-l** or **--mathlib** command-line flags are given, except that the extended
+**-l** or **-\-mathlib** command-line flags are given, except that the extended
 math library is not available when the **-s** option, the **-w** option, or
 equivalents are given.

@@ -921,8 +929,8 @@ The [standard][1] defines the following functions for the math library:

 ## Extended Library

-The extended library is *not* loaded when the **-s**/**--standard** or
-**-w**/**--warn** options are given since they are not part of the library
+The extended library is *not* loaded when the **-s**/**-\-standard** or
+**-w**/**-\-warn** options are given since they are not part of the library
 defined by the [standard][1].

 The extended library is a **non-portable extension**.
@@ -1590,17 +1598,17 @@ The other statuses will only be returned when bc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since bc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Per the [standard][1], bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, bc(1) attempts to recover from errors (see the **RESET**
@@ -25,19 +25,18 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "BC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "BC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH NAME
 .PP
 bc - arbitrary-precision decimal arithmetic language and calculator
 .SH SYNOPSIS
 .PP
-\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]\[en]global-stacks\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]mathlib\f[R]] [\f[B]\[en]no-prompt\f[R]]
-[\f[B]\[en]quiet\f[R]] [\f[B]\[en]standard\f[R]] [\f[B]\[en]warn\f[R]]
-[\f[B]\[en]version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]--global-stacks\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--mathlib\f[R]]
+[\f[B]--no-prompt\f[R]] [\f[B]--quiet\f[R]] [\f[B]--standard\f[R]]
+[\f[B]--warn\f[R]] [\f[B]--version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -55,7 +54,7 @@ the command line and executes them before reading from \f[B]stdin\f[R].
 .PP
 The following are the options that bc(1) accepts.
 .TP
-\f[B]-g\f[R], \f[B]\[en]global-stacks\f[R]
+\f[B]-g\f[R], \f[B]--global-stacks\f[R]
 Turns the globals \f[B]ibase\f[R], \f[B]obase\f[R], \f[B]scale\f[R], and
 \f[B]seed\f[R] into stacks.
 .RS
@@ -147,10 +146,10 @@ is ignored.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -158,7 +157,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-l\f[R], \f[B]\[en]mathlib\f[R]
+\f[B]-l\f[R], \f[B]--mathlib\f[R]
 Sets \f[B]scale\f[R] (see the \f[B]SYNTAX\f[R] section) to \f[B]20\f[R]
 and loads the included math library and the extended math library before
 running any code, including any expressions or files specified on the
@@ -168,25 +167,25 @@ command line.
 To learn what is in the libraries, see the \f[B]LIBRARY\f[R] section.
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 This option is a no-op.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-q\f[R], \f[B]\[en]quiet\f[R]
+\f[B]-q\f[R], \f[B]--quiet\f[R]
 This option is for compatibility with the GNU
 bc(1) (https://www.gnu.org/software/bc/); it is a no-op.
 Without this option, GNU bc(1) prints a copyright header.
 This bc(1) only prints the copyright header if one or more of the
-\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]\[en]version\f[R] options are given.
+\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]--version\f[R] options are given.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-s\f[R], \f[B]\[en]standard\f[R]
+\f[B]-s\f[R], \f[B]--standard\f[R]
 Process exactly the language defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html)
 and error if any extensions are used.
@@ -195,15 +194,15 @@ and error if any extensions are used.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-w\f[R], \f[B]\[en]warn\f[R]
-Like \f[B]-s\f[R] and \f[B]\[en]standard\f[R], except that warnings (and
+\f[B]-w\f[R], \f[B]--warn\f[R]
+Like \f[B]-s\f[R] and \f[B]--standard\f[R], except that warnings (and
 not errors) are printed for non-standard extensions and execution
 continues normally.
 .RS
@@ -211,7 +210,7 @@ continues normally.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -220,26 +219,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]BC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -248,6 +257,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other bc(1) implementations, this bc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -299,8 +311,8 @@ constant numbers.
 It is the \[lq]input\[rq] base, or the number base used for interpreting
 input numbers.
 \f[B]ibase\f[R] is initially \f[B]10\f[R].
-If the \f[B]-s\f[R] (\f[B]\[en]standard\f[R]) and \f[B]-w\f[R]
-(\f[B]\[en]warn\f[R]) flags were not given on the command line, the max
+If the \f[B]-s\f[R] (\f[B]--standard\f[R]) and \f[B]-w\f[R]
+(\f[B]--warn\f[R]) flags were not given on the command line, the max
 allowable value for \f[B]ibase\f[R] is \f[B]36\f[R].
 Otherwise, it is \f[B]16\f[R].
 The min allowable value for \f[B]ibase\f[R] is \f[B]2\f[R].
@@ -559,7 +571,7 @@ The following arithmetic and logical operators can be used.
 They are listed in order of decreasing precedence.
 Operators in the same group have the same precedence.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 Type: Prefix and Postfix
 .RS
 .PP
@@ -669,7 +681,7 @@ Description: \f[B]boolean or\f[R]
 .PP
 The operators will be described in more detail below.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 The prefix and postfix \f[B]increment\f[R] and \f[B]decrement\f[R]
 operators behave exactly like they would in C.
 They require a named expression (see the \f[I]Named Expressions\f[R]
@@ -1115,7 +1127,7 @@ This is a \f[B]non-portable extension\f[R].
 .PP
 All of the functions below, including the functions in the extended math
 library (see the \f[I]Extended Library\f[R] subsection below), are
-available when the \f[B]-l\f[R] or \f[B]\[en]mathlib\f[R] command-line
+available when the \f[B]-l\f[R] or \f[B]--mathlib\f[R] command-line
 flags are given, except that the extended math library is not available
 when the \f[B]-s\f[R] option, the \f[B]-w\f[R] option, or equivalents
 are given.
@@ -1176,7 +1188,7 @@ Functions\f[R] subsection below).
 .SS Extended Library
 .PP
 The extended library is \f[I]not\f[R] loaded when the
-\f[B]-s\f[R]/\f[B]\[en]standard\f[R] or \f[B]-w\f[R]/\f[B]\[en]warn\f[R]
+\f[B]-s\f[R]/\f[B]--standard\f[R] or \f[B]-w\f[R]/\f[B]--warn\f[R]
 options are given since they are not part of the library defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html).
 .PP
@@ -1934,11 +1946,11 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 bc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Per the
@@ -1946,7 +1958,7 @@ standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html),
 bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, bc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,8 +34,7 @@ bc - arbitrary-precision decimal arithmetic language and calculator

 # SYNOPSIS

-**bc** [**-ghilPqsvVw**] [**--global-stacks**] [**--help**] [**--interactive**] [**--mathlib**] [**--no-prompt**] [**--quiet**] [**--standard**] [**--warn**] [**--version**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...]
-[*file*...]
+**bc** [**-ghilPqsvVw**] [**-\-global-stacks**] [**-\-help**] [**-\-interactive**] [**-\-mathlib**] [**-\-no-prompt**] [**-\-quiet**] [**-\-standard**] [**-\-warn**] [**-\-version**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -51,7 +50,7 @@ command line and executes them before reading from **stdin**.

 The following are the options that bc(1) accepts.

-**-g**, **--global-stacks**
+**-g**, **-\-global-stacks**

 :   Turns the globals **ibase**, **obase**, **scale**, and **seed** into stacks.

@@ -119,17 +118,17 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-l**, **--mathlib**
+**-l**, **-\-mathlib**

 :   Sets **scale** (see the **SYNTAX** section) to **20** and loads the included
    math library and the extended math library before running any code,
@@ -137,63 +136,70 @@ The following are the options that bc(1) accepts.

    To learn what is in the libraries, see the **LIBRARY** section.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   This option is a no-op.

    This is a **non-portable extension**.

-**-q**, **--quiet**
+**-q**, **-\-quiet**

 :   This option is for compatibility with the [GNU bc(1)][2]; it is a no-op.
    Without this option, GNU bc(1) prints a copyright header. This bc(1) only
    prints the copyright header if one or more of the **-v**, **-V**, or
-    **--version** options are given.
+    **-\-version** options are given.

    This is a **non-portable extension**.

-**-s**, **--standard**
+**-s**, **-\-standard**

 :   Process exactly the language defined by the [standard][1] and error if any
    extensions are used.

    This is a **non-portable extension**.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

    This is a **non-portable extension**.

-**-w**, **--warn**
+**-w**, **-\-warn**

-:   Like **-s** and **--standard**, except that warnings (and not errors) are
+:   Like **-s** and **-\-standard**, except that warnings (and not errors) are
    printed for non-standard extensions and execution continues normally.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **BC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -201,7 +207,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other bc(1) implementations, this bc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -245,8 +253,8 @@ Identifiers with more than one character (letter) are a

 **ibase** is a global variable determining how to interpret constant numbers. It
 is the "input" base, or the number base used for interpreting input numbers.
-**ibase** is initially **10**. If the **-s** (**--standard**) and **-w**
-(**--warn**) flags were not given on the command line, the max allowable value
+**ibase** is initially **10**. If the **-s** (**-\-standard**) and **-w**
+(**-\-warn**) flags were not given on the command line, the max allowable value
 for **ibase** is **36**. Otherwise, it is **16**. The min allowable value for
 **ibase** is **2**. The max allowable value for **ibase** can be queried in
 bc(1) programs with the **maxibase()** built-in function.
@@ -436,7 +444,7 @@ The following arithmetic and logical operators can be used. They are listed in
 order of decreasing precedence. Operators in the same group have the same
 precedence.

-**++** **--**
+**++** **-\-**

 :   Type: Prefix and Postfix

@@ -534,7 +542,7 @@ precedence.

 The operators will be described in more detail below.

-**++** **--**
+**++** **-\-**

 :   The prefix and postfix **increment** and **decrement** operators behave
    exactly like they would in C. They require a named expression (see the
@@ -865,7 +873,7 @@ This is a **non-portable extension**.

 All of the functions below, including the functions in the extended math
 library (see the *Extended Library* subsection below), are available when the
-**-l** or **--mathlib** command-line flags are given, except that the extended
+**-l** or **-\-mathlib** command-line flags are given, except that the extended
 math library is not available when the **-s** option, the **-w** option, or
 equivalents are given.

@@ -917,8 +925,8 @@ The [standard][1] defines the following functions for the math library:

 ## Extended Library

-The extended library is *not* loaded when the **-s**/**--standard** or
-**-w**/**--warn** options are given since they are not part of the library
+The extended library is *not* loaded when the **-s**/**-\-standard** or
+**-w**/**-\-warn** options are given since they are not part of the library
 defined by the [standard][1].

 The extended library is a **non-portable extension**.
@@ -1586,17 +1594,17 @@ The other statuses will only be returned when bc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since bc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Per the [standard][1], bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, bc(1) attempts to recover from errors (see the **RESET**
@@ -25,19 +25,18 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "BC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "BC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH NAME
 .PP
 bc - arbitrary-precision decimal arithmetic language and calculator
 .SH SYNOPSIS
 .PP
-\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]\[en]global-stacks\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]mathlib\f[R]] [\f[B]\[en]no-prompt\f[R]]
-[\f[B]\[en]quiet\f[R]] [\f[B]\[en]standard\f[R]] [\f[B]\[en]warn\f[R]]
-[\f[B]\[en]version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]--global-stacks\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--mathlib\f[R]]
+[\f[B]--no-prompt\f[R]] [\f[B]--quiet\f[R]] [\f[B]--standard\f[R]]
+[\f[B]--warn\f[R]] [\f[B]--version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -55,7 +54,7 @@ the command line and executes them before reading from \f[B]stdin\f[R].
 .PP
 The following are the options that bc(1) accepts.
 .TP
-\f[B]-g\f[R], \f[B]\[en]global-stacks\f[R]
+\f[B]-g\f[R], \f[B]--global-stacks\f[R]
 Turns the globals \f[B]ibase\f[R], \f[B]obase\f[R], \f[B]scale\f[R], and
 \f[B]seed\f[R] into stacks.
 .RS
@@ -147,10 +146,10 @@ is ignored.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -158,7 +157,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-l\f[R], \f[B]\[en]mathlib\f[R]
+\f[B]-l\f[R], \f[B]--mathlib\f[R]
 Sets \f[B]scale\f[R] (see the \f[B]SYNTAX\f[R] section) to \f[B]20\f[R]
 and loads the included math library and the extended math library before
 running any code, including any expressions or files specified on the
@@ -168,25 +167,25 @@ command line.
 To learn what is in the libraries, see the \f[B]LIBRARY\f[R] section.
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 This option is a no-op.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-q\f[R], \f[B]\[en]quiet\f[R]
+\f[B]-q\f[R], \f[B]--quiet\f[R]
 This option is for compatibility with the GNU
 bc(1) (https://www.gnu.org/software/bc/); it is a no-op.
 Without this option, GNU bc(1) prints a copyright header.
 This bc(1) only prints the copyright header if one or more of the
-\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]\[en]version\f[R] options are given.
+\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]--version\f[R] options are given.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-s\f[R], \f[B]\[en]standard\f[R]
+\f[B]-s\f[R], \f[B]--standard\f[R]
 Process exactly the language defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html)
 and error if any extensions are used.
@@ -195,15 +194,15 @@ and error if any extensions are used.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-w\f[R], \f[B]\[en]warn\f[R]
-Like \f[B]-s\f[R] and \f[B]\[en]standard\f[R], except that warnings (and
+\f[B]-w\f[R], \f[B]--warn\f[R]
+Like \f[B]-s\f[R] and \f[B]--standard\f[R], except that warnings (and
 not errors) are printed for non-standard extensions and execution
 continues normally.
 .RS
@@ -211,7 +210,7 @@ continues normally.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -220,26 +219,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]BC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -248,6 +257,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other bc(1) implementations, this bc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -299,8 +311,8 @@ constant numbers.
 It is the \[lq]input\[rq] base, or the number base used for interpreting
 input numbers.
 \f[B]ibase\f[R] is initially \f[B]10\f[R].
-If the \f[B]-s\f[R] (\f[B]\[en]standard\f[R]) and \f[B]-w\f[R]
-(\f[B]\[en]warn\f[R]) flags were not given on the command line, the max
+If the \f[B]-s\f[R] (\f[B]--standard\f[R]) and \f[B]-w\f[R]
+(\f[B]--warn\f[R]) flags were not given on the command line, the max
 allowable value for \f[B]ibase\f[R] is \f[B]36\f[R].
 Otherwise, it is \f[B]16\f[R].
 The min allowable value for \f[B]ibase\f[R] is \f[B]2\f[R].
@@ -559,7 +571,7 @@ The following arithmetic and logical operators can be used.
 They are listed in order of decreasing precedence.
 Operators in the same group have the same precedence.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 Type: Prefix and Postfix
 .RS
 .PP
@@ -669,7 +681,7 @@ Description: \f[B]boolean or\f[R]
 .PP
 The operators will be described in more detail below.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 The prefix and postfix \f[B]increment\f[R] and \f[B]decrement\f[R]
 operators behave exactly like they would in C.
 They require a named expression (see the \f[I]Named Expressions\f[R]
@@ -1115,7 +1127,7 @@ This is a \f[B]non-portable extension\f[R].
 .PP
 All of the functions below, including the functions in the extended math
 library (see the \f[I]Extended Library\f[R] subsection below), are
-available when the \f[B]-l\f[R] or \f[B]\[en]mathlib\f[R] command-line
+available when the \f[B]-l\f[R] or \f[B]--mathlib\f[R] command-line
 flags are given, except that the extended math library is not available
 when the \f[B]-s\f[R] option, the \f[B]-w\f[R] option, or equivalents
 are given.
@@ -1176,7 +1188,7 @@ Functions\f[R] subsection below).
 .SS Extended Library
 .PP
 The extended library is \f[I]not\f[R] loaded when the
-\f[B]-s\f[R]/\f[B]\[en]standard\f[R] or \f[B]-w\f[R]/\f[B]\[en]warn\f[R]
+\f[B]-s\f[R]/\f[B]--standard\f[R] or \f[B]-w\f[R]/\f[B]--warn\f[R]
 options are given since they are not part of the library defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html).
 .PP
@@ -1934,11 +1946,11 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 bc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Per the
@@ -1946,7 +1958,7 @@ standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html),
 bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, bc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,8 +34,7 @@ bc - arbitrary-precision decimal arithmetic language and calculator

 # SYNOPSIS

-**bc** [**-ghilPqsvVw**] [**--global-stacks**] [**--help**] [**--interactive**] [**--mathlib**] [**--no-prompt**] [**--quiet**] [**--standard**] [**--warn**] [**--version**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...]
-[*file*...]
+**bc** [**-ghilPqsvVw**] [**-\-global-stacks**] [**-\-help**] [**-\-interactive**] [**-\-mathlib**] [**-\-no-prompt**] [**-\-quiet**] [**-\-standard**] [**-\-warn**] [**-\-version**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -51,7 +50,7 @@ command line and executes them before reading from **stdin**.

 The following are the options that bc(1) accepts.

-**-g**, **--global-stacks**
+**-g**, **-\-global-stacks**

 :   Turns the globals **ibase**, **obase**, **scale**, and **seed** into stacks.

@@ -119,17 +118,17 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-l**, **--mathlib**
+**-l**, **-\-mathlib**

 :   Sets **scale** (see the **SYNTAX** section) to **20** and loads the included
    math library and the extended math library before running any code,
@@ -137,63 +136,70 @@ The following are the options that bc(1) accepts.

    To learn what is in the libraries, see the **LIBRARY** section.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   This option is a no-op.

    This is a **non-portable extension**.

-**-q**, **--quiet**
+**-q**, **-\-quiet**

 :   This option is for compatibility with the [GNU bc(1)][2]; it is a no-op.
    Without this option, GNU bc(1) prints a copyright header. This bc(1) only
    prints the copyright header if one or more of the **-v**, **-V**, or
-    **--version** options are given.
+    **-\-version** options are given.

    This is a **non-portable extension**.

-**-s**, **--standard**
+**-s**, **-\-standard**

 :   Process exactly the language defined by the [standard][1] and error if any
    extensions are used.

    This is a **non-portable extension**.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

    This is a **non-portable extension**.

-**-w**, **--warn**
+**-w**, **-\-warn**

-:   Like **-s** and **--standard**, except that warnings (and not errors) are
+:   Like **-s** and **-\-standard**, except that warnings (and not errors) are
    printed for non-standard extensions and execution continues normally.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **BC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -201,7 +207,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other bc(1) implementations, this bc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -245,8 +253,8 @@ Identifiers with more than one character (letter) are a

 **ibase** is a global variable determining how to interpret constant numbers. It
 is the "input" base, or the number base used for interpreting input numbers.
-**ibase** is initially **10**. If the **-s** (**--standard**) and **-w**
-(**--warn**) flags were not given on the command line, the max allowable value
+**ibase** is initially **10**. If the **-s** (**-\-standard**) and **-w**
+(**-\-warn**) flags were not given on the command line, the max allowable value
 for **ibase** is **36**. Otherwise, it is **16**. The min allowable value for
 **ibase** is **2**. The max allowable value for **ibase** can be queried in
 bc(1) programs with the **maxibase()** built-in function.
@@ -436,7 +444,7 @@ The following arithmetic and logical operators can be used. They are listed in
 order of decreasing precedence. Operators in the same group have the same
 precedence.

-**++** **--**
+**++** **-\-**

 :   Type: Prefix and Postfix

@@ -534,7 +542,7 @@ precedence.

 The operators will be described in more detail below.

-**++** **--**
+**++** **-\-**

 :   The prefix and postfix **increment** and **decrement** operators behave
    exactly like they would in C. They require a named expression (see the
@@ -865,7 +873,7 @@ This is a **non-portable extension**.

 All of the functions below, including the functions in the extended math
 library (see the *Extended Library* subsection below), are available when the
-**-l** or **--mathlib** command-line flags are given, except that the extended
+**-l** or **-\-mathlib** command-line flags are given, except that the extended
 math library is not available when the **-s** option, the **-w** option, or
 equivalents are given.

@@ -917,8 +925,8 @@ The [standard][1] defines the following functions for the math library:

 ## Extended Library

-The extended library is *not* loaded when the **-s**/**--standard** or
-**-w**/**--warn** options are given since they are not part of the library
+The extended library is *not* loaded when the **-s**/**-\-standard** or
+**-w**/**-\-warn** options are given since they are not part of the library
 defined by the [standard][1].

 The extended library is a **non-portable extension**.
@@ -1586,17 +1594,17 @@ The other statuses will only be returned when bc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since bc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Per the [standard][1], bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, bc(1) attempts to recover from errors (see the **RESET**
@@ -25,19 +25,18 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "BC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "BC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH NAME
 .PP
 bc - arbitrary-precision decimal arithmetic language and calculator
 .SH SYNOPSIS
 .PP
-\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]\[en]global-stacks\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]mathlib\f[R]] [\f[B]\[en]no-prompt\f[R]]
-[\f[B]\[en]quiet\f[R]] [\f[B]\[en]standard\f[R]] [\f[B]\[en]warn\f[R]]
-[\f[B]\[en]version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]--global-stacks\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--mathlib\f[R]]
+[\f[B]--no-prompt\f[R]] [\f[B]--quiet\f[R]] [\f[B]--standard\f[R]]
+[\f[B]--warn\f[R]] [\f[B]--version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -60,7 +59,7 @@ implementations.
 .PP
 The following are the options that bc(1) accepts.
 .TP
-\f[B]-g\f[R], \f[B]\[en]global-stacks\f[R]
+\f[B]-g\f[R], \f[B]--global-stacks\f[R]
 Turns the globals \f[B]ibase\f[R], \f[B]obase\f[R], \f[B]scale\f[R], and
 \f[B]seed\f[R] into stacks.
 .RS
@@ -152,10 +151,10 @@ is ignored.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -163,7 +162,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-l\f[R], \f[B]\[en]mathlib\f[R]
+\f[B]-l\f[R], \f[B]--mathlib\f[R]
 Sets \f[B]scale\f[R] (see the \f[B]SYNTAX\f[R] section) to \f[B]20\f[R]
 and loads the included math library and the extended math library before
 running any code, including any expressions or files specified on the
@@ -173,7 +172,7 @@ command line.
 To learn what is in the libraries, see the \f[B]LIBRARY\f[R] section.
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 Disables the prompt in TTY mode.
 (The prompt is only enabled in TTY mode.
 See the \f[B]TTY MODE\f[R] section) This is mostly for those users that
@@ -185,18 +184,18 @@ Most of those users would want to put this option in
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-q\f[R], \f[B]\[en]quiet\f[R]
+\f[B]-q\f[R], \f[B]--quiet\f[R]
 This option is for compatibility with the GNU
 bc(1) (https://www.gnu.org/software/bc/); it is a no-op.
 Without this option, GNU bc(1) prints a copyright header.
 This bc(1) only prints the copyright header if one or more of the
-\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]\[en]version\f[R] options are given.
+\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]--version\f[R] options are given.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-s\f[R], \f[B]\[en]standard\f[R]
+\f[B]-s\f[R], \f[B]--standard\f[R]
 Process exactly the language defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html)
 and error if any extensions are used.
@@ -205,15 +204,15 @@ and error if any extensions are used.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-w\f[R], \f[B]\[en]warn\f[R]
-Like \f[B]-s\f[R] and \f[B]\[en]standard\f[R], except that warnings (and
+\f[B]-w\f[R], \f[B]--warn\f[R]
+Like \f[B]-s\f[R] and \f[B]--standard\f[R], except that warnings (and
 not errors) are printed for non-standard extensions and execution
 continues normally.
 .RS
@@ -221,7 +220,7 @@ continues normally.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -230,26 +229,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]BC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -258,6 +267,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other bc(1) implementations, this bc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -309,8 +321,8 @@ constant numbers.
 It is the \[lq]input\[rq] base, or the number base used for interpreting
 input numbers.
 \f[B]ibase\f[R] is initially \f[B]10\f[R].
-If the \f[B]-s\f[R] (\f[B]\[en]standard\f[R]) and \f[B]-w\f[R]
-(\f[B]\[en]warn\f[R]) flags were not given on the command line, the max
+If the \f[B]-s\f[R] (\f[B]--standard\f[R]) and \f[B]-w\f[R]
+(\f[B]--warn\f[R]) flags were not given on the command line, the max
 allowable value for \f[B]ibase\f[R] is \f[B]36\f[R].
 Otherwise, it is \f[B]16\f[R].
 The min allowable value for \f[B]ibase\f[R] is \f[B]2\f[R].
@@ -569,7 +581,7 @@ The following arithmetic and logical operators can be used.
 They are listed in order of decreasing precedence.
 Operators in the same group have the same precedence.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 Type: Prefix and Postfix
 .RS
 .PP
@@ -679,7 +691,7 @@ Description: \f[B]boolean or\f[R]
 .PP
 The operators will be described in more detail below.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 The prefix and postfix \f[B]increment\f[R] and \f[B]decrement\f[R]
 operators behave exactly like they would in C.
 They require a named expression (see the \f[I]Named Expressions\f[R]
@@ -1125,7 +1137,7 @@ This is a \f[B]non-portable extension\f[R].
 .PP
 All of the functions below, including the functions in the extended math
 library (see the \f[I]Extended Library\f[R] subsection below), are
-available when the \f[B]-l\f[R] or \f[B]\[en]mathlib\f[R] command-line
+available when the \f[B]-l\f[R] or \f[B]--mathlib\f[R] command-line
 flags are given, except that the extended math library is not available
 when the \f[B]-s\f[R] option, the \f[B]-w\f[R] option, or equivalents
 are given.
@@ -1186,7 +1198,7 @@ Functions\f[R] subsection below).
 .SS Extended Library
 .PP
 The extended library is \f[I]not\f[R] loaded when the
-\f[B]-s\f[R]/\f[B]\[en]standard\f[R] or \f[B]-w\f[R]/\f[B]\[en]warn\f[R]
+\f[B]-s\f[R]/\f[B]--standard\f[R] or \f[B]-w\f[R]/\f[B]--warn\f[R]
 options are given since they are not part of the library defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html).
 .PP
@@ -1944,11 +1956,11 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 bc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Per the
@@ -1956,7 +1968,7 @@ standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html),
 bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, bc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,8 +34,7 @@ bc - arbitrary-precision decimal arithmetic language and calculator

 # SYNOPSIS

-**bc** [**-ghilPqsvVw**] [**--global-stacks**] [**--help**] [**--interactive**] [**--mathlib**] [**--no-prompt**] [**--quiet**] [**--standard**] [**--warn**] [**--version**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...]
-[*file*...]
+**bc** [**-ghilPqsvVw**] [**-\-global-stacks**] [**-\-help**] [**-\-interactive**] [**-\-mathlib**] [**-\-no-prompt**] [**-\-quiet**] [**-\-standard**] [**-\-warn**] [**-\-version**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -55,7 +54,7 @@ other implementations.

 The following are the options that bc(1) accepts.

-**-g**, **--global-stacks**
+**-g**, **-\-global-stacks**

 :   Turns the globals **ibase**, **obase**, **scale**, and **seed** into stacks.

@@ -123,17 +122,17 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-l**, **--mathlib**
+**-l**, **-\-mathlib**

 :   Sets **scale** (see the **SYNTAX** section) to **20** and loads the included
    math library and the extended math library before running any code,
@@ -141,7 +140,7 @@ The following are the options that bc(1) accepts.

    To learn what is in the libraries, see the **LIBRARY** section.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   Disables the prompt in TTY mode. (The prompt is only enabled in TTY mode.
    See the **TTY MODE** section) This is mostly for those users that do not
@@ -151,57 +150,64 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-q**, **--quiet**
+**-q**, **-\-quiet**

 :   This option is for compatibility with the [GNU bc(1)][2]; it is a no-op.
    Without this option, GNU bc(1) prints a copyright header. This bc(1) only
    prints the copyright header if one or more of the **-v**, **-V**, or
-    **--version** options are given.
+    **-\-version** options are given.

    This is a **non-portable extension**.

-**-s**, **--standard**
+**-s**, **-\-standard**

 :   Process exactly the language defined by the [standard][1] and error if any
    extensions are used.

    This is a **non-portable extension**.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

    This is a **non-portable extension**.

-**-w**, **--warn**
+**-w**, **-\-warn**

-:   Like **-s** and **--standard**, except that warnings (and not errors) are
+:   Like **-s** and **-\-standard**, except that warnings (and not errors) are
    printed for non-standard extensions and execution continues normally.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **BC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -209,7 +215,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other bc(1) implementations, this bc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -253,8 +261,8 @@ Identifiers with more than one character (letter) are a

 **ibase** is a global variable determining how to interpret constant numbers. It
 is the "input" base, or the number base used for interpreting input numbers.
-**ibase** is initially **10**. If the **-s** (**--standard**) and **-w**
-(**--warn**) flags were not given on the command line, the max allowable value
+**ibase** is initially **10**. If the **-s** (**-\-standard**) and **-w**
+(**-\-warn**) flags were not given on the command line, the max allowable value
 for **ibase** is **36**. Otherwise, it is **16**. The min allowable value for
 **ibase** is **2**. The max allowable value for **ibase** can be queried in
 bc(1) programs with the **maxibase()** built-in function.
@@ -444,7 +452,7 @@ The following arithmetic and logical operators can be used. They are listed in
 order of decreasing precedence. Operators in the same group have the same
 precedence.

-**++** **--**
+**++** **-\-**

 :   Type: Prefix and Postfix

@@ -542,7 +550,7 @@ precedence.

 The operators will be described in more detail below.

-**++** **--**
+**++** **-\-**

 :   The prefix and postfix **increment** and **decrement** operators behave
    exactly like they would in C. They require a named expression (see the
@@ -873,7 +881,7 @@ This is a **non-portable extension**.

 All of the functions below, including the functions in the extended math
 library (see the *Extended Library* subsection below), are available when the
-**-l** or **--mathlib** command-line flags are given, except that the extended
+**-l** or **-\-mathlib** command-line flags are given, except that the extended
 math library is not available when the **-s** option, the **-w** option, or
 equivalents are given.

@@ -925,8 +933,8 @@ The [standard][1] defines the following functions for the math library:

 ## Extended Library

-The extended library is *not* loaded when the **-s**/**--standard** or
-**-w**/**--warn** options are given since they are not part of the library
+The extended library is *not* loaded when the **-s**/**-\-standard** or
+**-w**/**-\-warn** options are given since they are not part of the library
 defined by the [standard][1].

 The extended library is a **non-portable extension**.
@@ -1594,17 +1602,17 @@ The other statuses will only be returned when bc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since bc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Per the [standard][1], bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, bc(1) attempts to recover from errors (see the **RESET**
@@ -25,19 +25,18 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "BC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "BC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH NAME
 .PP
 bc - arbitrary-precision decimal arithmetic language and calculator
 .SH SYNOPSIS
 .PP
-\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]\[en]global-stacks\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]mathlib\f[R]] [\f[B]\[en]no-prompt\f[R]]
-[\f[B]\[en]quiet\f[R]] [\f[B]\[en]standard\f[R]] [\f[B]\[en]warn\f[R]]
-[\f[B]\[en]version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]--global-stacks\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--mathlib\f[R]]
+[\f[B]--no-prompt\f[R]] [\f[B]--quiet\f[R]] [\f[B]--standard\f[R]]
+[\f[B]--warn\f[R]] [\f[B]--version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -60,7 +59,7 @@ implementations.
 .PP
 The following are the options that bc(1) accepts.
 .TP
-\f[B]-g\f[R], \f[B]\[en]global-stacks\f[R]
+\f[B]-g\f[R], \f[B]--global-stacks\f[R]
 Turns the globals \f[B]ibase\f[R], \f[B]obase\f[R], \f[B]scale\f[R], and
 \f[B]seed\f[R] into stacks.
 .RS
@@ -152,10 +151,10 @@ is ignored.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -163,7 +162,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-l\f[R], \f[B]\[en]mathlib\f[R]
+\f[B]-l\f[R], \f[B]--mathlib\f[R]
 Sets \f[B]scale\f[R] (see the \f[B]SYNTAX\f[R] section) to \f[B]20\f[R]
 and loads the included math library and the extended math library before
 running any code, including any expressions or files specified on the
@@ -173,25 +172,25 @@ command line.
 To learn what is in the libraries, see the \f[B]LIBRARY\f[R] section.
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 This option is a no-op.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-q\f[R], \f[B]\[en]quiet\f[R]
+\f[B]-q\f[R], \f[B]--quiet\f[R]
 This option is for compatibility with the GNU
 bc(1) (https://www.gnu.org/software/bc/); it is a no-op.
 Without this option, GNU bc(1) prints a copyright header.
 This bc(1) only prints the copyright header if one or more of the
-\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]\[en]version\f[R] options are given.
+\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]--version\f[R] options are given.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-s\f[R], \f[B]\[en]standard\f[R]
+\f[B]-s\f[R], \f[B]--standard\f[R]
 Process exactly the language defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html)
 and error if any extensions are used.
@@ -200,15 +199,15 @@ and error if any extensions are used.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-w\f[R], \f[B]\[en]warn\f[R]
-Like \f[B]-s\f[R] and \f[B]\[en]standard\f[R], except that warnings (and
+\f[B]-w\f[R], \f[B]--warn\f[R]
+Like \f[B]-s\f[R] and \f[B]--standard\f[R], except that warnings (and
 not errors) are printed for non-standard extensions and execution
 continues normally.
 .RS
@@ -216,7 +215,7 @@ continues normally.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -225,26 +224,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]BC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -253,6 +262,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other bc(1) implementations, this bc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -304,8 +316,8 @@ constant numbers.
 It is the \[lq]input\[rq] base, or the number base used for interpreting
 input numbers.
 \f[B]ibase\f[R] is initially \f[B]10\f[R].
-If the \f[B]-s\f[R] (\f[B]\[en]standard\f[R]) and \f[B]-w\f[R]
-(\f[B]\[en]warn\f[R]) flags were not given on the command line, the max
+If the \f[B]-s\f[R] (\f[B]--standard\f[R]) and \f[B]-w\f[R]
+(\f[B]--warn\f[R]) flags were not given on the command line, the max
 allowable value for \f[B]ibase\f[R] is \f[B]36\f[R].
 Otherwise, it is \f[B]16\f[R].
 The min allowable value for \f[B]ibase\f[R] is \f[B]2\f[R].
@@ -564,7 +576,7 @@ The following arithmetic and logical operators can be used.
 They are listed in order of decreasing precedence.
 Operators in the same group have the same precedence.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 Type: Prefix and Postfix
 .RS
 .PP
@@ -674,7 +686,7 @@ Description: \f[B]boolean or\f[R]
 .PP
 The operators will be described in more detail below.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 The prefix and postfix \f[B]increment\f[R] and \f[B]decrement\f[R]
 operators behave exactly like they would in C.
 They require a named expression (see the \f[I]Named Expressions\f[R]
@@ -1120,7 +1132,7 @@ This is a \f[B]non-portable extension\f[R].
 .PP
 All of the functions below, including the functions in the extended math
 library (see the \f[I]Extended Library\f[R] subsection below), are
-available when the \f[B]-l\f[R] or \f[B]\[en]mathlib\f[R] command-line
+available when the \f[B]-l\f[R] or \f[B]--mathlib\f[R] command-line
 flags are given, except that the extended math library is not available
 when the \f[B]-s\f[R] option, the \f[B]-w\f[R] option, or equivalents
 are given.
@@ -1181,7 +1193,7 @@ Functions\f[R] subsection below).
 .SS Extended Library
 .PP
 The extended library is \f[I]not\f[R] loaded when the
-\f[B]-s\f[R]/\f[B]\[en]standard\f[R] or \f[B]-w\f[R]/\f[B]\[en]warn\f[R]
+\f[B]-s\f[R]/\f[B]--standard\f[R] or \f[B]-w\f[R]/\f[B]--warn\f[R]
 options are given since they are not part of the library defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html).
 .PP
@@ -1939,11 +1951,11 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 bc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Per the
@@ -1951,7 +1963,7 @@ standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html),
 bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, bc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,8 +34,7 @@ bc - arbitrary-precision decimal arithmetic language and calculator

 # SYNOPSIS

-**bc** [**-ghilPqsvVw**] [**--global-stacks**] [**--help**] [**--interactive**] [**--mathlib**] [**--no-prompt**] [**--quiet**] [**--standard**] [**--warn**] [**--version**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...]
-[*file*...]
+**bc** [**-ghilPqsvVw**] [**-\-global-stacks**] [**-\-help**] [**-\-interactive**] [**-\-mathlib**] [**-\-no-prompt**] [**-\-quiet**] [**-\-standard**] [**-\-warn**] [**-\-version**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -55,7 +54,7 @@ other implementations.

 The following are the options that bc(1) accepts.

-**-g**, **--global-stacks**
+**-g**, **-\-global-stacks**

 :   Turns the globals **ibase**, **obase**, **scale**, and **seed** into stacks.

@@ -123,17 +122,17 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-l**, **--mathlib**
+**-l**, **-\-mathlib**

 :   Sets **scale** (see the **SYNTAX** section) to **20** and loads the included
    math library and the extended math library before running any code,
@@ -141,63 +140,70 @@ The following are the options that bc(1) accepts.

    To learn what is in the libraries, see the **LIBRARY** section.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   This option is a no-op.

    This is a **non-portable extension**.

-**-q**, **--quiet**
+**-q**, **-\-quiet**

 :   This option is for compatibility with the [GNU bc(1)][2]; it is a no-op.
    Without this option, GNU bc(1) prints a copyright header. This bc(1) only
    prints the copyright header if one or more of the **-v**, **-V**, or
-    **--version** options are given.
+    **-\-version** options are given.

    This is a **non-portable extension**.

-**-s**, **--standard**
+**-s**, **-\-standard**

 :   Process exactly the language defined by the [standard][1] and error if any
    extensions are used.

    This is a **non-portable extension**.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

    This is a **non-portable extension**.

-**-w**, **--warn**
+**-w**, **-\-warn**

-:   Like **-s** and **--standard**, except that warnings (and not errors) are
+:   Like **-s** and **-\-standard**, except that warnings (and not errors) are
    printed for non-standard extensions and execution continues normally.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **BC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -205,7 +211,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other bc(1) implementations, this bc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -249,8 +257,8 @@ Identifiers with more than one character (letter) are a

 **ibase** is a global variable determining how to interpret constant numbers. It
 is the "input" base, or the number base used for interpreting input numbers.
-**ibase** is initially **10**. If the **-s** (**--standard**) and **-w**
-(**--warn**) flags were not given on the command line, the max allowable value
+**ibase** is initially **10**. If the **-s** (**-\-standard**) and **-w**
+(**-\-warn**) flags were not given on the command line, the max allowable value
 for **ibase** is **36**. Otherwise, it is **16**. The min allowable value for
 **ibase** is **2**. The max allowable value for **ibase** can be queried in
 bc(1) programs with the **maxibase()** built-in function.
@@ -440,7 +448,7 @@ The following arithmetic and logical operators can be used. They are listed in
 order of decreasing precedence. Operators in the same group have the same
 precedence.

-**++** **--**
+**++** **-\-**

 :   Type: Prefix and Postfix

@@ -538,7 +546,7 @@ precedence.

 The operators will be described in more detail below.

-**++** **--**
+**++** **-\-**

 :   The prefix and postfix **increment** and **decrement** operators behave
    exactly like they would in C. They require a named expression (see the
@@ -869,7 +877,7 @@ This is a **non-portable extension**.

 All of the functions below, including the functions in the extended math
 library (see the *Extended Library* subsection below), are available when the
-**-l** or **--mathlib** command-line flags are given, except that the extended
+**-l** or **-\-mathlib** command-line flags are given, except that the extended
 math library is not available when the **-s** option, the **-w** option, or
 equivalents are given.

@@ -921,8 +929,8 @@ The [standard][1] defines the following functions for the math library:

 ## Extended Library

-The extended library is *not* loaded when the **-s**/**--standard** or
-**-w**/**--warn** options are given since they are not part of the library
+The extended library is *not* loaded when the **-s**/**-\-standard** or
+**-w**/**-\-warn** options are given since they are not part of the library
 defined by the [standard][1].

 The extended library is a **non-portable extension**.
@@ -1590,17 +1598,17 @@ The other statuses will only be returned when bc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since bc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Per the [standard][1], bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, bc(1) attempts to recover from errors (see the **RESET**
@@ -25,19 +25,18 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "BC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "BC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH NAME
 .PP
 bc - arbitrary-precision decimal arithmetic language and calculator
 .SH SYNOPSIS
 .PP
-\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]\[en]global-stacks\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]mathlib\f[R]] [\f[B]\[en]no-prompt\f[R]]
-[\f[B]\[en]quiet\f[R]] [\f[B]\[en]standard\f[R]] [\f[B]\[en]warn\f[R]]
-[\f[B]\[en]version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]bc\f[R] [\f[B]-ghilPqsvVw\f[R]] [\f[B]--global-stacks\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--mathlib\f[R]]
+[\f[B]--no-prompt\f[R]] [\f[B]--quiet\f[R]] [\f[B]--standard\f[R]]
+[\f[B]--warn\f[R]] [\f[B]--version\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -60,7 +59,7 @@ implementations.
 .PP
 The following are the options that bc(1) accepts.
 .TP
-\f[B]-g\f[R], \f[B]\[en]global-stacks\f[R]
+\f[B]-g\f[R], \f[B]--global-stacks\f[R]
 Turns the globals \f[B]ibase\f[R], \f[B]obase\f[R], \f[B]scale\f[R], and
 \f[B]seed\f[R] into stacks.
 .RS
@@ -152,10 +151,10 @@ is ignored.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -163,7 +162,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-l\f[R], \f[B]\[en]mathlib\f[R]
+\f[B]-l\f[R], \f[B]--mathlib\f[R]
 Sets \f[B]scale\f[R] (see the \f[B]SYNTAX\f[R] section) to \f[B]20\f[R]
 and loads the included math library and the extended math library before
 running any code, including any expressions or files specified on the
@@ -173,25 +172,25 @@ command line.
 To learn what is in the libraries, see the \f[B]LIBRARY\f[R] section.
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 This option is a no-op.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-q\f[R], \f[B]\[en]quiet\f[R]
+\f[B]-q\f[R], \f[B]--quiet\f[R]
 This option is for compatibility with the GNU
 bc(1) (https://www.gnu.org/software/bc/); it is a no-op.
 Without this option, GNU bc(1) prints a copyright header.
 This bc(1) only prints the copyright header if one or more of the
-\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]\[en]version\f[R] options are given.
+\f[B]-v\f[R], \f[B]-V\f[R], or \f[B]--version\f[R] options are given.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-s\f[R], \f[B]\[en]standard\f[R]
+\f[B]-s\f[R], \f[B]--standard\f[R]
 Process exactly the language defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html)
 and error if any extensions are used.
@@ -200,15 +199,15 @@ and error if any extensions are used.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-w\f[R], \f[B]\[en]warn\f[R]
-Like \f[B]-s\f[R] and \f[B]\[en]standard\f[R], except that warnings (and
+\f[B]-w\f[R], \f[B]--warn\f[R]
+Like \f[B]-s\f[R] and \f[B]--standard\f[R], except that warnings (and
 not errors) are printed for non-standard extensions and execution
 continues normally.
 .RS
@@ -216,7 +215,7 @@ continues normally.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -225,26 +224,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]BC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, bc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]BC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, bc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, bc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -253,6 +262,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other bc(1) implementations, this bc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -304,8 +316,8 @@ constant numbers.
 It is the \[lq]input\[rq] base, or the number base used for interpreting
 input numbers.
 \f[B]ibase\f[R] is initially \f[B]10\f[R].
-If the \f[B]-s\f[R] (\f[B]\[en]standard\f[R]) and \f[B]-w\f[R]
-(\f[B]\[en]warn\f[R]) flags were not given on the command line, the max
+If the \f[B]-s\f[R] (\f[B]--standard\f[R]) and \f[B]-w\f[R]
+(\f[B]--warn\f[R]) flags were not given on the command line, the max
 allowable value for \f[B]ibase\f[R] is \f[B]36\f[R].
 Otherwise, it is \f[B]16\f[R].
 The min allowable value for \f[B]ibase\f[R] is \f[B]2\f[R].
@@ -564,7 +576,7 @@ The following arithmetic and logical operators can be used.
 They are listed in order of decreasing precedence.
 Operators in the same group have the same precedence.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 Type: Prefix and Postfix
 .RS
 .PP
@@ -674,7 +686,7 @@ Description: \f[B]boolean or\f[R]
 .PP
 The operators will be described in more detail below.
 .TP
-\f[B]++\f[R] \f[B]\[en]\f[R]
+\f[B]++\f[R] \f[B]--\f[R]
 The prefix and postfix \f[B]increment\f[R] and \f[B]decrement\f[R]
 operators behave exactly like they would in C.
 They require a named expression (see the \f[I]Named Expressions\f[R]
@@ -1120,7 +1132,7 @@ This is a \f[B]non-portable extension\f[R].
 .PP
 All of the functions below, including the functions in the extended math
 library (see the \f[I]Extended Library\f[R] subsection below), are
-available when the \f[B]-l\f[R] or \f[B]\[en]mathlib\f[R] command-line
+available when the \f[B]-l\f[R] or \f[B]--mathlib\f[R] command-line
 flags are given, except that the extended math library is not available
 when the \f[B]-s\f[R] option, the \f[B]-w\f[R] option, or equivalents
 are given.
@@ -1181,7 +1193,7 @@ Functions\f[R] subsection below).
 .SS Extended Library
 .PP
 The extended library is \f[I]not\f[R] loaded when the
-\f[B]-s\f[R]/\f[B]\[en]standard\f[R] or \f[B]-w\f[R]/\f[B]\[en]warn\f[R]
+\f[B]-s\f[R]/\f[B]--standard\f[R] or \f[B]-w\f[R]/\f[B]--warn\f[R]
 options are given since they are not part of the library defined by the
 standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html).
 .PP
@@ -1939,11 +1951,11 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 bc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Per the
@@ -1951,7 +1963,7 @@ standard (https://pubs.opengroup.org/onlinepubs/9699919799/utilities/bc.html),
 bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, bc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,8 +34,7 @@ bc - arbitrary-precision decimal arithmetic language and calculator

 # SYNOPSIS

-**bc** [**-ghilPqsvVw**] [**--global-stacks**] [**--help**] [**--interactive**] [**--mathlib**] [**--no-prompt**] [**--quiet**] [**--standard**] [**--warn**] [**--version**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...]
-[*file*...]
+**bc** [**-ghilPqsvVw**] [**-\-global-stacks**] [**-\-help**] [**-\-interactive**] [**-\-mathlib**] [**-\-no-prompt**] [**-\-quiet**] [**-\-standard**] [**-\-warn**] [**-\-version**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -55,7 +54,7 @@ other implementations.

 The following are the options that bc(1) accepts.

-**-g**, **--global-stacks**
+**-g**, **-\-global-stacks**

 :   Turns the globals **ibase**, **obase**, **scale**, and **seed** into stacks.

@@ -123,17 +122,17 @@ The following are the options that bc(1) accepts.

    This is a **non-portable extension**.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-l**, **--mathlib**
+**-l**, **-\-mathlib**

 :   Sets **scale** (see the **SYNTAX** section) to **20** and loads the included
    math library and the extended math library before running any code,
@@ -141,63 +140,70 @@ The following are the options that bc(1) accepts.

    To learn what is in the libraries, see the **LIBRARY** section.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   This option is a no-op.

    This is a **non-portable extension**.

-**-q**, **--quiet**
+**-q**, **-\-quiet**

 :   This option is for compatibility with the [GNU bc(1)][2]; it is a no-op.
    Without this option, GNU bc(1) prints a copyright header. This bc(1) only
    prints the copyright header if one or more of the **-v**, **-V**, or
-    **--version** options are given.
+    **-\-version** options are given.

    This is a **non-portable extension**.

-**-s**, **--standard**
+**-s**, **-\-standard**

 :   Process exactly the language defined by the [standard][1] and error if any
    extensions are used.

    This is a **non-portable extension**.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

    This is a **non-portable extension**.

-**-w**, **--warn**
+**-w**, **-\-warn**

-:   Like **-s** and **--standard**, except that warnings (and not errors) are
+:   Like **-s** and **-\-standard**, except that warnings (and not errors) are
    printed for non-standard extensions and execution continues normally.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **BC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, bc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **BC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, bc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, bc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -205,7 +211,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other bc(1) implementations, this bc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -249,8 +257,8 @@ Identifiers with more than one character (letter) are a

 **ibase** is a global variable determining how to interpret constant numbers. It
 is the "input" base, or the number base used for interpreting input numbers.
-**ibase** is initially **10**. If the **-s** (**--standard**) and **-w**
-(**--warn**) flags were not given on the command line, the max allowable value
+**ibase** is initially **10**. If the **-s** (**-\-standard**) and **-w**
+(**-\-warn**) flags were not given on the command line, the max allowable value
 for **ibase** is **36**. Otherwise, it is **16**. The min allowable value for
 **ibase** is **2**. The max allowable value for **ibase** can be queried in
 bc(1) programs with the **maxibase()** built-in function.
@@ -440,7 +448,7 @@ The following arithmetic and logical operators can be used. They are listed in
 order of decreasing precedence. Operators in the same group have the same
 precedence.

-**++** **--**
+**++** **-\-**

 :   Type: Prefix and Postfix

@@ -538,7 +546,7 @@ precedence.

 The operators will be described in more detail below.

-**++** **--**
+**++** **-\-**

 :   The prefix and postfix **increment** and **decrement** operators behave
    exactly like they would in C. They require a named expression (see the
@@ -869,7 +877,7 @@ This is a **non-portable extension**.

 All of the functions below, including the functions in the extended math
 library (see the *Extended Library* subsection below), are available when the
-**-l** or **--mathlib** command-line flags are given, except that the extended
+**-l** or **-\-mathlib** command-line flags are given, except that the extended
 math library is not available when the **-s** option, the **-w** option, or
 equivalents are given.

@@ -921,8 +929,8 @@ The [standard][1] defines the following functions for the math library:

 ## Extended Library

-The extended library is *not* loaded when the **-s**/**--standard** or
-**-w**/**--warn** options are given since they are not part of the library
+The extended library is *not* loaded when the **-s**/**-\-standard** or
+**-w**/**-\-warn** options are given since they are not part of the library
 defined by the [standard][1].

 The extended library is a **non-portable extension**.
@@ -1590,17 +1598,17 @@ The other statuses will only be returned when bc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since bc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow bc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Per the [standard][1], bc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, bc(1) attempts to recover from errors (see the **RESET**
@@ -25,7 +25,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "BCL" "3" "January 2021" "Gavin D. Howard" "Libraries Manual"
+.TH "BCL" "3" "March 2021" "Gavin D. Howard" "Libraries Manual"
 .SH NAME
 .PP
 bcl - library of arbitrary precision decimal arithmetic
@@ -426,7 +426,7 @@ All procedures in this section require a valid current context.
    bcl(3) will encode an error in the return value, if there was one. The error
    can be queried with **bcl_err(BclNumber)**. Possible errors include:

-	* **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_INVALID_CONTEXT**
    * **BCL_ERROR_FATAL_ALLOC_ERR**

 **void bcl_num_free(BclNumber** *n***)**
@@ -487,7 +487,7 @@ subsection below.
    can be queried with **bcl_err(BclNumber)**. Possible errors include:

    * **BCL_ERROR_INVALID_NUM**
-	* **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_INVALID_CONTEXT**
    * **BCL_ERROR_PARSE_INVALID_STR**
    * **BCL_ERROR_FATAL_ALLOC_ERR**

@@ -524,7 +524,7 @@ subsection below.
    bcl(3) will encode an error in the return value, if there was one. The error
    can be queried with **bcl_err(BclNumber)**. Possible errors include:

-	* **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_INVALID_CONTEXT**
    * **BCL_ERROR_FATAL_ALLOC_ERR**

 ## Math
@@ -551,7 +551,7 @@ All procedures in this section can return the following errors:
    can be queried with **bcl_err(BclNumber)**. Possible errors include:

    * **BCL_ERROR_INVALID_NUM**
-	* **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_INVALID_CONTEXT**
    * **BCL_ERROR_FATAL_ALLOC_ERR**

 **BclNumber bcl_sub(BclNumber** *a***, BclNumber** *b***)**
@@ -568,7 +568,7 @@ All procedures in this section can return the following errors:
    can be queried with **bcl_err(BclNumber)**. Possible errors include:

    * **BCL_ERROR_INVALID_NUM**
-	* **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_INVALID_CONTEXT**
    * **BCL_ERROR_FATAL_ALLOC_ERR**

 **BclNumber bcl_mul(BclNumber** *a***, BclNumber** *b***)**
@@ -587,7 +587,7 @@ All procedures in this section can return the following errors:
    can be queried with **bcl_err(BclNumber)**. Possible errors include:

    * **BCL_ERROR_INVALID_NUM**
-	* **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_INVALID_CONTEXT**
    * **BCL_ERROR_FATAL_ALLOC_ERR**

 **BclNumber bcl_div(BclNumber** *a***, BclNumber** *b***)**
@@ -606,8 +606,8 @@ All procedures in this section can return the following errors:
    can be queried with **bcl_err(BclNumber)**. Possible errors include:

    * **BCL_ERROR_INVALID_NUM**
-	* **BCL_ERROR_INVALID_CONTEXT**
-	* **BCL_ERROR_MATH_DIVIDE_BY_ZERO**
+    * **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_MATH_DIVIDE_BY_ZERO**
    * **BCL_ERROR_FATAL_ALLOC_ERR**

 **BclNumber bcl_mod(BclNumber** *a***, BclNumber** *b***)**
@@ -626,8 +626,8 @@ All procedures in this section can return the following errors:
    can be queried with **bcl_err(BclNumber)**. Possible errors include:

    * **BCL_ERROR_INVALID_NUM**
-	* **BCL_ERROR_INVALID_CONTEXT**
-	* **BCL_ERROR_MATH_DIVIDE_BY_ZERO**
+    * **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_MATH_DIVIDE_BY_ZERO**
    * **BCL_ERROR_FATAL_ALLOC_ERR**

 **BclNumber bcl_pow(BclNumber** *a***, BclNumber** *b***)**
@@ -649,10 +649,10 @@ All procedures in this section can return the following errors:
    can be queried with **bcl_err(BclNumber)**. Possible errors include:

    * **BCL_ERROR_INVALID_NUM**
-	* **BCL_ERROR_INVALID_CONTEXT**
-	* **BCL_ERROR_MATH_NON_INTEGER**
-	* **BCL_ERROR_MATH_OVERFLOW**
-	* **BCL_ERROR_MATH_DIVIDE_BY_ZERO**
+    * **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_MATH_NON_INTEGER**
+    * **BCL_ERROR_MATH_OVERFLOW**
+    * **BCL_ERROR_MATH_DIVIDE_BY_ZERO**
    * **BCL_ERROR_FATAL_ALLOC_ERR**

 **BclNumber bcl_lshift(BclNumber** *a***, BclNumber** *b***)**
@@ -671,8 +671,8 @@ All procedures in this section can return the following errors:
    can be queried with **bcl_err(BclNumber)**. Possible errors include:

    * **BCL_ERROR_INVALID_NUM**
-	* **BCL_ERROR_INVALID_CONTEXT**
-	* **BCL_ERROR_MATH_NON_INTEGER**
+    * **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_MATH_NON_INTEGER**
    * **BCL_ERROR_FATAL_ALLOC_ERR**

 **BclNumber bcl_rshift(BclNumber** *a***, BclNumber** *b***)**
@@ -691,8 +691,8 @@ All procedures in this section can return the following errors:
    can be queried with **bcl_err(BclNumber)**. Possible errors include:

    * **BCL_ERROR_INVALID_NUM**
-	* **BCL_ERROR_INVALID_CONTEXT**
-	* **BCL_ERROR_MATH_NON_INTEGER**
+    * **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_MATH_NON_INTEGER**
    * **BCL_ERROR_FATAL_ALLOC_ERR**

 **BclNumber bcl_sqrt(BclNumber** *a***)**
@@ -709,8 +709,8 @@ All procedures in this section can return the following errors:
    can be queried with **bcl_err(BclNumber)**. Possible errors include:

    * **BCL_ERROR_INVALID_NUM**
-	* **BCL_ERROR_INVALID_CONTEXT**
-	* **BCL_ERROR_MATH_NEGATIVE**
+    * **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_MATH_NEGATIVE**
    * **BCL_ERROR_FATAL_ALLOC_ERR**

 **BclError bcl_divmod(BclNumber** *a***, BclNumber** *b***, BclNumber \****c***, BclNumber \****d***)**
@@ -719,7 +719,7 @@ All procedures in this section can return the following errors:
    into the space pointed to by *c*, and puts the modulus in a new number which
    is put into the space pointed to by *d*.

-	*b* cannot be **0**.
+    *b* cannot be **0**.

    *a* and *b* are consumed; they cannot be used after the call. See the
    **Consumption and Propagation** subsection below.
@@ -731,8 +731,8 @@ All procedures in this section can return the following errors:
    function can return:

    * **BCL_ERROR_INVALID_NUM**
-	* **BCL_ERROR_INVALID_CONTEXT**
-	* **BCL_ERROR_MATH_DIVIDE_BY_ZERO**
+    * **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_MATH_DIVIDE_BY_ZERO**
    * **BCL_ERROR_FATAL_ALLOC_ERR**

 **BclNumber bcl_modexp(BclNumber** *a***, BclNumber** *b***, BclNumber** *c***)**
@@ -751,10 +751,10 @@ All procedures in this section can return the following errors:
    can be queried with **bcl_err(BclNumber)**. Possible errors include:

    * **BCL_ERROR_INVALID_NUM**
-	* **BCL_ERROR_INVALID_CONTEXT**
-	* **BCL_ERROR_MATH_NEGATIVE**
-	* **BCL_ERROR_MATH_NON_INTEGER**
-	* **BCL_ERROR_MATH_DIVIDE_BY_ZERO**
+    * **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_MATH_NEGATIVE**
+    * **BCL_ERROR_MATH_NON_INTEGER**
+    * **BCL_ERROR_MATH_DIVIDE_BY_ZERO**
    * **BCL_ERROR_FATAL_ALLOC_ERR**

 ## Miscellaneous
@@ -791,7 +791,7 @@ All procedures in this section can return the following errors:
    can be queried with **bcl_err(BclNumber)**. Possible errors include:

    * **BCL_ERROR_INVALID_NUM**
-	* **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_INVALID_CONTEXT**
    * **BCL_ERROR_FATAL_ALLOC_ERR**

 ## Pseudo-Random Number Generator
@@ -852,9 +852,9 @@ procedures require a valid current context.
    can be queried with **bcl_err(BclNumber)**. Possible errors include:

    * **BCL_ERROR_INVALID_NUM**
-	* **BCL_ERROR_INVALID_CONTEXT**
-	* **BCL_ERROR_MATH_NEGATIVE**
-	* **BCL_ERROR_MATH_NON_INTEGER**
+    * **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_MATH_NEGATIVE**
+    * **BCL_ERROR_MATH_NON_INTEGER**
    * **BCL_ERROR_FATAL_ALLOC_ERR**

 **BclNumber bcl_frand(size_t** *places***)**
@@ -868,7 +868,7 @@ procedures require a valid current context.
    bcl(3) will encode an error in the return value, if there was one. The error
    can be queried with **bcl_err(BclNumber)**. Possible errors include:

-	* **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_INVALID_CONTEXT**
    * **BCL_ERROR_FATAL_ALLOC_ERR**

 **BclNumber bcl_ifrand(BclNumber** *a***, size_t** *places***)**
@@ -887,9 +887,9 @@ procedures require a valid current context.
    can be queried with **bcl_err(BclNumber)**. Possible errors include:

    * **BCL_ERROR_INVALID_NUM**
-	* **BCL_ERROR_INVALID_CONTEXT**
-	* **BCL_ERROR_MATH_NEGATIVE**
-	* **BCL_ERROR_MATH_NON_INTEGER**
+    * **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_MATH_NEGATIVE**
+    * **BCL_ERROR_MATH_NON_INTEGER**
    * **BCL_ERROR_FATAL_ALLOC_ERR**

 **BclError bcl_rand_seedWithNum(BclNumber** *n***)**
@@ -904,7 +904,7 @@ procedures require a valid current context.
    function can return:

    * **BCL_ERROR_INVALID_NUM**
-	* **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_INVALID_CONTEXT**

    Note that if **bcl_rand_seed2num(***void***)** or
    **bcl_rand_seed2num_err(BclNumber)** are called right after this function,
@@ -917,7 +917,7 @@ procedures require a valid current context.
    If there was no error, **BCL_ERROR_NONE** is returned. Otherwise, this
    function can return:

-	* **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_INVALID_CONTEXT**

 **void bcl_rand_reseed(***void***)**

@@ -935,7 +935,7 @@ procedures require a valid current context.
    bcl(3) will encode an error in the return value, if there was one. The error
    can be queried with **bcl_err(BclNumber)**. Possible errors include:

-	* **BCL_ERROR_INVALID_CONTEXT**
+    * **BCL_ERROR_INVALID_CONTEXT**
    * **BCL_ERROR_FATAL_ALLOC_ERR**

 **BclRandInt bcl_rand_int(***void***)**
@@ -164,6 +164,22 @@ Can be overridden by passing the `--bindir` option to `configure.sh`.

 Defaults to `$PREFIX/bin`.

+### `INCLUDEDIR`
+
+The directory to install header files in.
+
+Can be overridden by passing the `--includedir` option to `configure.sh`.
+
+Defaults to `$PREFIX/include`.
+
+### `LIBDIR`
+
+The directory to install libraries in.
+
+Can be overridden by passing the `--libdir` option to `configure.sh`.
+
+Defaults to `$PREFIX/lib`.
+
 ### `DATAROOTDIR`

 The root directory to install data files in.
@@ -34,7 +34,7 @@ dc - arbitrary-precision decimal reverse-Polish notation calculator

 # SYNOPSIS

-**dc** [**-hiPvVx**] [**--version**] [**--help**] [**--interactive**] [**--no-prompt**] [**--extended-register**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...] [*file*...]
+**dc** [**-hiPvVx**] [**-\-version**] [**-\-help**] [**-\-interactive**] [**-\-no-prompt**] [**-\-extended-register**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -43,11 +43,11 @@ notation) to store numbers and results of computations. Arithmetic operations
 pop arguments off of the stack and push the results.

 If no files are given on the command-line as extra arguments (i.e., not as
-**-f** or **--file** arguments), then dc(1) reads from **stdin**. Otherwise,
+**-f** or **-\-file** arguments), then dc(1) reads from **stdin**. Otherwise,
 those files are processed, and dc(1) will then exit.

 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where **-e** (**--expression**) and **-f** (**--file**)
+implementations, where **-e** (**-\-expression**) and **-f** (**-\-file**)
 arguments cause dc(1) to execute them and exit. The reason for this is that this
 dc(1) allows users to set arguments in the environment variable **DC_ENV_ARGS**
 (see the **ENVIRONMENT VARIABLES** section). Any expressions given on the
@@ -64,21 +64,21 @@ as the last command-line argument or define the environment variable

 The following are the options that dc(1) accepts.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 {{ A E H N EH EN HN EHN }}
 :   Disables the prompt in TTY mode. (The prompt is only enabled in TTY mode.
@@ -92,35 +92,42 @@ The following are the options that dc(1) accepts.

    This is a **non-portable extension**.

-**-x** **--extended-register**
+**-x** **-\-extended-register**

 :   Enables extended register mode. See the *Extended Register Mode* subsection
    of the **REGISTERS** section for more information.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **DC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -128,7 +135,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other dc(1) implementations, this dc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -209,7 +218,7 @@ command or the **"** command that does not get receive a value of **0** or
 **'** and **"** commands are guaranteed to **NOT** be cryptographically secure.
 This is a consequence of using a seeded pseudo-random number generator. However,
 they *are* guaranteed to be reproducible with identical **seed** values. This
-means that the pseudo-random values from bc(1) should only be used where a
+means that the pseudo-random values from dc(1) should only be used where a
 reproducible stream of pseudo-random numbers is *ESSENTIAL*. In any other case,
 use a non-seeded pseudo-random number generator.

@@ -938,7 +947,7 @@ follows any command that needs a register name. The only exception is a newline
 Unlike most other dc(1) implentations, this dc(1) provides nearly unlimited
 amounts of registers, if extended register mode is enabled.

-If extended register mode is enabled (**-x** or **--extended-register**
+If extended register mode is enabled (**-x** or **-\-extended-register**
 command-line arguments are given), then normal single character registers are
 used *unless* the character immediately following a command that needs a
 register name is a space (according to **isspace()**) and not a newline
@@ -1073,7 +1082,7 @@ dc(1) recognizes the following environment variables:

    The quote parsing will handle either kind of quotes, **'** or **"**. Thus,
    if you have a file with any number of single quotes in the name, you can use
-    double quotes as the outside quotes, as in **"some 'bc' file.bc"**, and vice
+    double quotes as the outside quotes, as in **"some 'dc' file.dc"**, and vice
    versa if you have a file with double quotes. However, handling a file with
    both kinds of quotes in **DC_ENV_ARGS** is not supported due to the
    complexity of the parsing, though such files are still supported on the
@@ -1159,17 +1168,17 @@ The other statuses will only be returned when dc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since dc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, dc(1) attempts to recover from errors (see the **RESET**
@@ -25,18 +25,17 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "DC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "DC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH Name
 .PP
 dc - arbitrary-precision decimal reverse-Polish notation calculator
 .SH SYNOPSIS
 .PP
-\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]\[en]version\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]no-prompt\f[R]] [\f[B]\[en]extended-register\f[R]]
-[\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]--version\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--no-prompt\f[R]]
+[\f[B]--extended-register\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -47,13 +46,13 @@ Arithmetic operations pop arguments off of the stack and push the
 results.
 .PP
 If no files are given on the command-line as extra arguments (i.e., not
-as \f[B]-f\f[R] or \f[B]\[en]file\f[R] arguments), then dc(1) reads from
+as \f[B]-f\f[R] or \f[B]--file\f[R] arguments), then dc(1) reads from
 \f[B]stdin\f[R].
 Otherwise, those files are processed, and dc(1) will then exit.
 .PP
 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where \f[B]-e\f[R] (\f[B]\[en]expression\f[R]) and
-\f[B]-f\f[R] (\f[B]\[en]file\f[R]) arguments cause dc(1) to execute them
+implementations, where \f[B]-e\f[R] (\f[B]--expression\f[R]) and
+\f[B]-f\f[R] (\f[B]--file\f[R]) arguments cause dc(1) to execute them
 and exit.
 The reason for this is that this dc(1) allows users to set arguments in
 the environment variable \f[B]DC_ENV_ARGS\f[R] (see the \f[B]ENVIRONMENT
@@ -72,13 +71,13 @@ argument or define the environment variable \f[B]DC_EXPR_EXIT\f[R].
 .PP
 The following are the options that dc(1) accepts.
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -86,7 +85,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 Disables the prompt in TTY mode.
 (The prompt is only enabled in TTY mode.
 See the \f[B]TTY MODE\f[R] section) This is mostly for those users that
@@ -98,7 +97,7 @@ Most of those users would want to put this option in
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-x\f[R] \f[B]\[en]extended-register\f[R]
+\f[B]-x\f[R] \f[B]--extended-register\f[R]
 Enables extended register mode.
 See the \f[I]Extended Register Mode\f[R] subsection of the
 \f[B]REGISTERS\f[R] section for more information.
@@ -107,7 +106,7 @@ See the \f[I]Extended Register Mode\f[R] subsection of the
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -116,26 +115,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]DC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -144,6 +153,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other dc(1) implementations, this dc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -235,7 +247,7 @@ guaranteed to \f[B]NOT\f[R] be cryptographically secure.
 This is a consequence of using a seeded pseudo-random number generator.
 However, they \f[I]are\f[R] guaranteed to be reproducible with identical
 \f[B]seed\f[R] values.
-This means that the pseudo-random values from bc(1) should only be used
+This means that the pseudo-random values from dc(1) should only be used
 where a reproducible stream of pseudo-random numbers is
 \f[I]ESSENTIAL\f[R].
 In any other case, use a non-seeded pseudo-random number generator.
@@ -1024,7 +1036,7 @@ Unlike most other dc(1) implentations, this dc(1) provides nearly
 unlimited amounts of registers, if extended register mode is enabled.
 .PP
 If extended register mode is enabled (\f[B]-x\f[R] or
-\f[B]\[en]extended-register\f[R] command-line arguments are given), then
+\f[B]--extended-register\f[R] command-line arguments are given), then
 normal single character registers are used \f[I]unless\f[R] the
 character immediately following a command that needs a register name is
 a space (according to \f[B]isspace()\f[R]) and not a newline
@@ -1164,7 +1176,7 @@ will be correctly parsed, but the string \f[B]\[lq]/home/gavin/some
 The quote parsing will handle either kind of quotes, \f[B]\[cq]\f[R] or
 \f[B]\[lq]\f[R]. Thus, if you have a file with any number of single
 quotes in the name, you can use double quotes as the outside quotes, as
-in \f[B]\[rq]some `bc' file.bc\[dq]\f[R], and vice versa if you have a
+in \f[B]\[rq]some `dc' file.dc\[dq]\f[R], and vice versa if you have a
 file with double quotes.
 However, handling a file with both kinds of quotes in
 \f[B]DC_ENV_ARGS\f[R] is not supported due to the complexity of the
@@ -1247,17 +1259,17 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 dc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, dc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,7 +34,7 @@ dc - arbitrary-precision decimal reverse-Polish notation calculator

 # SYNOPSIS

-**dc** [**-hiPvVx**] [**--version**] [**--help**] [**--interactive**] [**--no-prompt**] [**--extended-register**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...] [*file*...]
+**dc** [**-hiPvVx**] [**-\-version**] [**-\-help**] [**-\-interactive**] [**-\-no-prompt**] [**-\-extended-register**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -43,11 +43,11 @@ notation) to store numbers and results of computations. Arithmetic operations
 pop arguments off of the stack and push the results.

 If no files are given on the command-line as extra arguments (i.e., not as
-**-f** or **--file** arguments), then dc(1) reads from **stdin**. Otherwise,
+**-f** or **-\-file** arguments), then dc(1) reads from **stdin**. Otherwise,
 those files are processed, and dc(1) will then exit.

 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where **-e** (**--expression**) and **-f** (**--file**)
+implementations, where **-e** (**-\-expression**) and **-f** (**-\-file**)
 arguments cause dc(1) to execute them and exit. The reason for this is that this
 dc(1) allows users to set arguments in the environment variable **DC_ENV_ARGS**
 (see the **ENVIRONMENT VARIABLES** section). Any expressions given on the
@@ -64,21 +64,21 @@ as the last command-line argument or define the environment variable

 The following are the options that dc(1) accepts.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   Disables the prompt in TTY mode. (The prompt is only enabled in TTY mode.
    See the **TTY MODE** section) This is mostly for those users that do not
@@ -87,35 +87,42 @@ The following are the options that dc(1) accepts.

    This is a **non-portable extension**.

-**-x** **--extended-register**
+**-x** **-\-extended-register**

 :   Enables extended register mode. See the *Extended Register Mode* subsection
    of the **REGISTERS** section for more information.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **DC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -123,7 +130,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other dc(1) implementations, this dc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -198,7 +207,7 @@ command or the **"** command that does not get receive a value of **0** or
 **'** and **"** commands are guaranteed to **NOT** be cryptographically secure.
 This is a consequence of using a seeded pseudo-random number generator. However,
 they *are* guaranteed to be reproducible with identical **seed** values. This
-means that the pseudo-random values from bc(1) should only be used where a
+means that the pseudo-random values from dc(1) should only be used where a
 reproducible stream of pseudo-random numbers is *ESSENTIAL*. In any other case,
 use a non-seeded pseudo-random number generator.

@@ -900,7 +909,7 @@ follows any command that needs a register name. The only exception is a newline
 Unlike most other dc(1) implentations, this dc(1) provides nearly unlimited
 amounts of registers, if extended register mode is enabled.

-If extended register mode is enabled (**-x** or **--extended-register**
+If extended register mode is enabled (**-x** or **-\-extended-register**
 command-line arguments are given), then normal single character registers are
 used *unless* the character immediately following a command that needs a
 register name is a space (according to **isspace()**) and not a newline
@@ -1033,7 +1042,7 @@ dc(1) recognizes the following environment variables:

    The quote parsing will handle either kind of quotes, **'** or **"**. Thus,
    if you have a file with any number of single quotes in the name, you can use
-    double quotes as the outside quotes, as in **"some 'bc' file.bc"**, and vice
+    double quotes as the outside quotes, as in **"some 'dc' file.dc"**, and vice
    versa if you have a file with double quotes. However, handling a file with
    both kinds of quotes in **DC_ENV_ARGS** is not supported due to the
    complexity of the parsing, though such files are still supported on the
@@ -1109,17 +1118,17 @@ The other statuses will only be returned when dc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since dc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, dc(1) attempts to recover from errors (see the **RESET**
@@ -25,18 +25,17 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "DC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "DC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH Name
 .PP
 dc - arbitrary-precision decimal reverse-Polish notation calculator
 .SH SYNOPSIS
 .PP
-\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]\[en]version\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]no-prompt\f[R]] [\f[B]\[en]extended-register\f[R]]
-[\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]--version\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--no-prompt\f[R]]
+[\f[B]--extended-register\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -47,13 +46,13 @@ Arithmetic operations pop arguments off of the stack and push the
 results.
 .PP
 If no files are given on the command-line as extra arguments (i.e., not
-as \f[B]-f\f[R] or \f[B]\[en]file\f[R] arguments), then dc(1) reads from
+as \f[B]-f\f[R] or \f[B]--file\f[R] arguments), then dc(1) reads from
 \f[B]stdin\f[R].
 Otherwise, those files are processed, and dc(1) will then exit.
 .PP
 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where \f[B]-e\f[R] (\f[B]\[en]expression\f[R]) and
-\f[B]-f\f[R] (\f[B]\[en]file\f[R]) arguments cause dc(1) to execute them
+implementations, where \f[B]-e\f[R] (\f[B]--expression\f[R]) and
+\f[B]-f\f[R] (\f[B]--file\f[R]) arguments cause dc(1) to execute them
 and exit.
 The reason for this is that this dc(1) allows users to set arguments in
 the environment variable \f[B]DC_ENV_ARGS\f[R] (see the \f[B]ENVIRONMENT
@@ -72,13 +71,13 @@ argument or define the environment variable \f[B]DC_EXPR_EXIT\f[R].
 .PP
 The following are the options that dc(1) accepts.
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -86,7 +85,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 Disables the prompt in TTY mode.
 (The prompt is only enabled in TTY mode.
 See the \f[B]TTY MODE\f[R] section) This is mostly for those users that
@@ -98,7 +97,7 @@ Most of those users would want to put this option in
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-x\f[R] \f[B]\[en]extended-register\f[R]
+\f[B]-x\f[R] \f[B]--extended-register\f[R]
 Enables extended register mode.
 See the \f[I]Extended Register Mode\f[R] subsection of the
 \f[B]REGISTERS\f[R] section for more information.
@@ -107,7 +106,7 @@ See the \f[I]Extended Register Mode\f[R] subsection of the
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -116,26 +115,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]DC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -144,6 +153,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other dc(1) implementations, this dc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -824,7 +836,7 @@ Unlike most other dc(1) implentations, this dc(1) provides nearly
 unlimited amounts of registers, if extended register mode is enabled.
 .PP
 If extended register mode is enabled (\f[B]-x\f[R] or
-\f[B]\[en]extended-register\f[R] command-line arguments are given), then
+\f[B]--extended-register\f[R] command-line arguments are given), then
 normal single character registers are used \f[I]unless\f[R] the
 character immediately following a command that needs a register name is
 a space (according to \f[B]isspace()\f[R]) and not a newline
@@ -959,7 +971,7 @@ will be correctly parsed, but the string \f[B]\[lq]/home/gavin/some
 The quote parsing will handle either kind of quotes, \f[B]\[cq]\f[R] or
 \f[B]\[lq]\f[R]. Thus, if you have a file with any number of single
 quotes in the name, you can use double quotes as the outside quotes, as
-in \f[B]\[rq]some `bc' file.bc\[dq]\f[R], and vice versa if you have a
+in \f[B]\[rq]some `dc' file.dc\[dq]\f[R], and vice versa if you have a
 file with double quotes.
 However, handling a file with both kinds of quotes in
 \f[B]DC_ENV_ARGS\f[R] is not supported due to the complexity of the
@@ -1039,17 +1051,17 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 dc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, dc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,7 +34,7 @@ dc - arbitrary-precision decimal reverse-Polish notation calculator

 # SYNOPSIS

-**dc** [**-hiPvVx**] [**--version**] [**--help**] [**--interactive**] [**--no-prompt**] [**--extended-register**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...] [*file*...]
+**dc** [**-hiPvVx**] [**-\-version**] [**-\-help**] [**-\-interactive**] [**-\-no-prompt**] [**-\-extended-register**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -43,11 +43,11 @@ notation) to store numbers and results of computations. Arithmetic operations
 pop arguments off of the stack and push the results.

 If no files are given on the command-line as extra arguments (i.e., not as
-**-f** or **--file** arguments), then dc(1) reads from **stdin**. Otherwise,
+**-f** or **-\-file** arguments), then dc(1) reads from **stdin**. Otherwise,
 those files are processed, and dc(1) will then exit.

 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where **-e** (**--expression**) and **-f** (**--file**)
+implementations, where **-e** (**-\-expression**) and **-f** (**-\-file**)
 arguments cause dc(1) to execute them and exit. The reason for this is that this
 dc(1) allows users to set arguments in the environment variable **DC_ENV_ARGS**
 (see the **ENVIRONMENT VARIABLES** section). Any expressions given on the
@@ -64,21 +64,21 @@ as the last command-line argument or define the environment variable

 The following are the options that dc(1) accepts.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   Disables the prompt in TTY mode. (The prompt is only enabled in TTY mode.
    See the **TTY MODE** section) This is mostly for those users that do not
@@ -87,35 +87,42 @@ The following are the options that dc(1) accepts.

    This is a **non-portable extension**.

-**-x** **--extended-register**
+**-x** **-\-extended-register**

 :   Enables extended register mode. See the *Extended Register Mode* subsection
    of the **REGISTERS** section for more information.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **DC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -123,7 +130,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other dc(1) implementations, this dc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -740,7 +749,7 @@ follows any command that needs a register name. The only exception is a newline
 Unlike most other dc(1) implentations, this dc(1) provides nearly unlimited
 amounts of registers, if extended register mode is enabled.

-If extended register mode is enabled (**-x** or **--extended-register**
+If extended register mode is enabled (**-x** or **-\-extended-register**
 command-line arguments are given), then normal single character registers are
 used *unless* the character immediately following a command that needs a
 register name is a space (according to **isspace()**) and not a newline
@@ -868,7 +877,7 @@ dc(1) recognizes the following environment variables:

    The quote parsing will handle either kind of quotes, **'** or **"**. Thus,
    if you have a file with any number of single quotes in the name, you can use
-    double quotes as the outside quotes, as in **"some 'bc' file.bc"**, and vice
+    double quotes as the outside quotes, as in **"some 'dc' file.dc"**, and vice
    versa if you have a file with double quotes. However, handling a file with
    both kinds of quotes in **DC_ENV_ARGS** is not supported due to the
    complexity of the parsing, though such files are still supported on the
@@ -942,17 +951,17 @@ The other statuses will only be returned when dc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since dc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, dc(1) attempts to recover from errors (see the **RESET**
@@ -25,18 +25,17 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "DC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "DC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH Name
 .PP
 dc - arbitrary-precision decimal reverse-Polish notation calculator
 .SH SYNOPSIS
 .PP
-\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]\[en]version\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]no-prompt\f[R]] [\f[B]\[en]extended-register\f[R]]
-[\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]--version\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--no-prompt\f[R]]
+[\f[B]--extended-register\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -47,13 +46,13 @@ Arithmetic operations pop arguments off of the stack and push the
 results.
 .PP
 If no files are given on the command-line as extra arguments (i.e., not
-as \f[B]-f\f[R] or \f[B]\[en]file\f[R] arguments), then dc(1) reads from
+as \f[B]-f\f[R] or \f[B]--file\f[R] arguments), then dc(1) reads from
 \f[B]stdin\f[R].
 Otherwise, those files are processed, and dc(1) will then exit.
 .PP
 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where \f[B]-e\f[R] (\f[B]\[en]expression\f[R]) and
-\f[B]-f\f[R] (\f[B]\[en]file\f[R]) arguments cause dc(1) to execute them
+implementations, where \f[B]-e\f[R] (\f[B]--expression\f[R]) and
+\f[B]-f\f[R] (\f[B]--file\f[R]) arguments cause dc(1) to execute them
 and exit.
 The reason for this is that this dc(1) allows users to set arguments in
 the environment variable \f[B]DC_ENV_ARGS\f[R] (see the \f[B]ENVIRONMENT
@@ -72,13 +71,13 @@ argument or define the environment variable \f[B]DC_EXPR_EXIT\f[R].
 .PP
 The following are the options that dc(1) accepts.
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -86,7 +85,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 Disables the prompt in TTY mode.
 (The prompt is only enabled in TTY mode.
 See the \f[B]TTY MODE\f[R] section) This is mostly for those users that
@@ -98,7 +97,7 @@ Most of those users would want to put this option in
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-x\f[R] \f[B]\[en]extended-register\f[R]
+\f[B]-x\f[R] \f[B]--extended-register\f[R]
 Enables extended register mode.
 See the \f[I]Extended Register Mode\f[R] subsection of the
 \f[B]REGISTERS\f[R] section for more information.
@@ -107,7 +106,7 @@ See the \f[I]Extended Register Mode\f[R] subsection of the
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -116,26 +115,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]DC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -144,6 +153,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other dc(1) implementations, this dc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -824,7 +836,7 @@ Unlike most other dc(1) implentations, this dc(1) provides nearly
 unlimited amounts of registers, if extended register mode is enabled.
 .PP
 If extended register mode is enabled (\f[B]-x\f[R] or
-\f[B]\[en]extended-register\f[R] command-line arguments are given), then
+\f[B]--extended-register\f[R] command-line arguments are given), then
 normal single character registers are used \f[I]unless\f[R] the
 character immediately following a command that needs a register name is
 a space (according to \f[B]isspace()\f[R]) and not a newline
@@ -959,7 +971,7 @@ will be correctly parsed, but the string \f[B]\[lq]/home/gavin/some
 The quote parsing will handle either kind of quotes, \f[B]\[cq]\f[R] or
 \f[B]\[lq]\f[R]. Thus, if you have a file with any number of single
 quotes in the name, you can use double quotes as the outside quotes, as
-in \f[B]\[rq]some `bc' file.bc\[dq]\f[R], and vice versa if you have a
+in \f[B]\[rq]some `dc' file.dc\[dq]\f[R], and vice versa if you have a
 file with double quotes.
 However, handling a file with both kinds of quotes in
 \f[B]DC_ENV_ARGS\f[R] is not supported due to the complexity of the
@@ -1039,17 +1051,17 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 dc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, dc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,7 +34,7 @@ dc - arbitrary-precision decimal reverse-Polish notation calculator

 # SYNOPSIS

-**dc** [**-hiPvVx**] [**--version**] [**--help**] [**--interactive**] [**--no-prompt**] [**--extended-register**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...] [*file*...]
+**dc** [**-hiPvVx**] [**-\-version**] [**-\-help**] [**-\-interactive**] [**-\-no-prompt**] [**-\-extended-register**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -43,11 +43,11 @@ notation) to store numbers and results of computations. Arithmetic operations
 pop arguments off of the stack and push the results.

 If no files are given on the command-line as extra arguments (i.e., not as
-**-f** or **--file** arguments), then dc(1) reads from **stdin**. Otherwise,
+**-f** or **-\-file** arguments), then dc(1) reads from **stdin**. Otherwise,
 those files are processed, and dc(1) will then exit.

 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where **-e** (**--expression**) and **-f** (**--file**)
+implementations, where **-e** (**-\-expression**) and **-f** (**-\-file**)
 arguments cause dc(1) to execute them and exit. The reason for this is that this
 dc(1) allows users to set arguments in the environment variable **DC_ENV_ARGS**
 (see the **ENVIRONMENT VARIABLES** section). Any expressions given on the
@@ -64,21 +64,21 @@ as the last command-line argument or define the environment variable

 The following are the options that dc(1) accepts.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   Disables the prompt in TTY mode. (The prompt is only enabled in TTY mode.
    See the **TTY MODE** section) This is mostly for those users that do not
@@ -87,35 +87,42 @@ The following are the options that dc(1) accepts.

    This is a **non-portable extension**.

-**-x** **--extended-register**
+**-x** **-\-extended-register**

 :   Enables extended register mode. See the *Extended Register Mode* subsection
    of the **REGISTERS** section for more information.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **DC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -123,7 +130,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other dc(1) implementations, this dc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -740,7 +749,7 @@ follows any command that needs a register name. The only exception is a newline
 Unlike most other dc(1) implentations, this dc(1) provides nearly unlimited
 amounts of registers, if extended register mode is enabled.

-If extended register mode is enabled (**-x** or **--extended-register**
+If extended register mode is enabled (**-x** or **-\-extended-register**
 command-line arguments are given), then normal single character registers are
 used *unless* the character immediately following a command that needs a
 register name is a space (according to **isspace()**) and not a newline
@@ -868,7 +877,7 @@ dc(1) recognizes the following environment variables:

    The quote parsing will handle either kind of quotes, **'** or **"**. Thus,
    if you have a file with any number of single quotes in the name, you can use
-    double quotes as the outside quotes, as in **"some 'bc' file.bc"**, and vice
+    double quotes as the outside quotes, as in **"some 'dc' file.dc"**, and vice
    versa if you have a file with double quotes. However, handling a file with
    both kinds of quotes in **DC_ENV_ARGS** is not supported due to the
    complexity of the parsing, though such files are still supported on the
@@ -942,17 +951,17 @@ The other statuses will only be returned when dc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since dc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, dc(1) attempts to recover from errors (see the **RESET**
@@ -25,18 +25,17 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "DC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "DC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH Name
 .PP
 dc - arbitrary-precision decimal reverse-Polish notation calculator
 .SH SYNOPSIS
 .PP
-\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]\[en]version\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]no-prompt\f[R]] [\f[B]\[en]extended-register\f[R]]
-[\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]--version\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--no-prompt\f[R]]
+[\f[B]--extended-register\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -47,13 +46,13 @@ Arithmetic operations pop arguments off of the stack and push the
 results.
 .PP
 If no files are given on the command-line as extra arguments (i.e., not
-as \f[B]-f\f[R] or \f[B]\[en]file\f[R] arguments), then dc(1) reads from
+as \f[B]-f\f[R] or \f[B]--file\f[R] arguments), then dc(1) reads from
 \f[B]stdin\f[R].
 Otherwise, those files are processed, and dc(1) will then exit.
 .PP
 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where \f[B]-e\f[R] (\f[B]\[en]expression\f[R]) and
-\f[B]-f\f[R] (\f[B]\[en]file\f[R]) arguments cause dc(1) to execute them
+implementations, where \f[B]-e\f[R] (\f[B]--expression\f[R]) and
+\f[B]-f\f[R] (\f[B]--file\f[R]) arguments cause dc(1) to execute them
 and exit.
 The reason for this is that this dc(1) allows users to set arguments in
 the environment variable \f[B]DC_ENV_ARGS\f[R] (see the \f[B]ENVIRONMENT
@@ -72,13 +71,13 @@ argument or define the environment variable \f[B]DC_EXPR_EXIT\f[R].
 .PP
 The following are the options that dc(1) accepts.
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -86,7 +85,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 Disables the prompt in TTY mode.
 (The prompt is only enabled in TTY mode.
 See the \f[B]TTY MODE\f[R] section) This is mostly for those users that
@@ -98,7 +97,7 @@ Most of those users would want to put this option in
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-x\f[R] \f[B]\[en]extended-register\f[R]
+\f[B]-x\f[R] \f[B]--extended-register\f[R]
 Enables extended register mode.
 See the \f[I]Extended Register Mode\f[R] subsection of the
 \f[B]REGISTERS\f[R] section for more information.
@@ -107,7 +106,7 @@ See the \f[I]Extended Register Mode\f[R] subsection of the
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -116,26 +115,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]DC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -144,6 +153,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other dc(1) implementations, this dc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -824,7 +836,7 @@ Unlike most other dc(1) implentations, this dc(1) provides nearly
 unlimited amounts of registers, if extended register mode is enabled.
 .PP
 If extended register mode is enabled (\f[B]-x\f[R] or
-\f[B]\[en]extended-register\f[R] command-line arguments are given), then
+\f[B]--extended-register\f[R] command-line arguments are given), then
 normal single character registers are used \f[I]unless\f[R] the
 character immediately following a command that needs a register name is
 a space (according to \f[B]isspace()\f[R]) and not a newline
@@ -959,7 +971,7 @@ will be correctly parsed, but the string \f[B]\[lq]/home/gavin/some
 The quote parsing will handle either kind of quotes, \f[B]\[cq]\f[R] or
 \f[B]\[lq]\f[R]. Thus, if you have a file with any number of single
 quotes in the name, you can use double quotes as the outside quotes, as
-in \f[B]\[rq]some `bc' file.bc\[dq]\f[R], and vice versa if you have a
+in \f[B]\[rq]some `dc' file.dc\[dq]\f[R], and vice versa if you have a
 file with double quotes.
 However, handling a file with both kinds of quotes in
 \f[B]DC_ENV_ARGS\f[R] is not supported due to the complexity of the
@@ -1039,17 +1051,17 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 dc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, dc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,7 +34,7 @@ dc - arbitrary-precision decimal reverse-Polish notation calculator

 # SYNOPSIS

-**dc** [**-hiPvVx**] [**--version**] [**--help**] [**--interactive**] [**--no-prompt**] [**--extended-register**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...] [*file*...]
+**dc** [**-hiPvVx**] [**-\-version**] [**-\-help**] [**-\-interactive**] [**-\-no-prompt**] [**-\-extended-register**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -43,11 +43,11 @@ notation) to store numbers and results of computations. Arithmetic operations
 pop arguments off of the stack and push the results.

 If no files are given on the command-line as extra arguments (i.e., not as
-**-f** or **--file** arguments), then dc(1) reads from **stdin**. Otherwise,
+**-f** or **-\-file** arguments), then dc(1) reads from **stdin**. Otherwise,
 those files are processed, and dc(1) will then exit.

 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where **-e** (**--expression**) and **-f** (**--file**)
+implementations, where **-e** (**-\-expression**) and **-f** (**-\-file**)
 arguments cause dc(1) to execute them and exit. The reason for this is that this
 dc(1) allows users to set arguments in the environment variable **DC_ENV_ARGS**
 (see the **ENVIRONMENT VARIABLES** section). Any expressions given on the
@@ -64,21 +64,21 @@ as the last command-line argument or define the environment variable

 The following are the options that dc(1) accepts.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   Disables the prompt in TTY mode. (The prompt is only enabled in TTY mode.
    See the **TTY MODE** section) This is mostly for those users that do not
@@ -87,35 +87,42 @@ The following are the options that dc(1) accepts.

    This is a **non-portable extension**.

-**-x** **--extended-register**
+**-x** **-\-extended-register**

 :   Enables extended register mode. See the *Extended Register Mode* subsection
    of the **REGISTERS** section for more information.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **DC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -123,7 +130,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other dc(1) implementations, this dc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -740,7 +749,7 @@ follows any command that needs a register name. The only exception is a newline
 Unlike most other dc(1) implentations, this dc(1) provides nearly unlimited
 amounts of registers, if extended register mode is enabled.

-If extended register mode is enabled (**-x** or **--extended-register**
+If extended register mode is enabled (**-x** or **-\-extended-register**
 command-line arguments are given), then normal single character registers are
 used *unless* the character immediately following a command that needs a
 register name is a space (according to **isspace()**) and not a newline
@@ -868,7 +877,7 @@ dc(1) recognizes the following environment variables:

    The quote parsing will handle either kind of quotes, **'** or **"**. Thus,
    if you have a file with any number of single quotes in the name, you can use
-    double quotes as the outside quotes, as in **"some 'bc' file.bc"**, and vice
+    double quotes as the outside quotes, as in **"some 'dc' file.dc"**, and vice
    versa if you have a file with double quotes. However, handling a file with
    both kinds of quotes in **DC_ENV_ARGS** is not supported due to the
    complexity of the parsing, though such files are still supported on the
@@ -942,17 +951,17 @@ The other statuses will only be returned when dc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since dc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, dc(1) attempts to recover from errors (see the **RESET**
@@ -25,18 +25,17 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "DC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "DC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH Name
 .PP
 dc - arbitrary-precision decimal reverse-Polish notation calculator
 .SH SYNOPSIS
 .PP
-\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]\[en]version\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]no-prompt\f[R]] [\f[B]\[en]extended-register\f[R]]
-[\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]--version\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--no-prompt\f[R]]
+[\f[B]--extended-register\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -47,13 +46,13 @@ Arithmetic operations pop arguments off of the stack and push the
 results.
 .PP
 If no files are given on the command-line as extra arguments (i.e., not
-as \f[B]-f\f[R] or \f[B]\[en]file\f[R] arguments), then dc(1) reads from
+as \f[B]-f\f[R] or \f[B]--file\f[R] arguments), then dc(1) reads from
 \f[B]stdin\f[R].
 Otherwise, those files are processed, and dc(1) will then exit.
 .PP
 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where \f[B]-e\f[R] (\f[B]\[en]expression\f[R]) and
-\f[B]-f\f[R] (\f[B]\[en]file\f[R]) arguments cause dc(1) to execute them
+implementations, where \f[B]-e\f[R] (\f[B]--expression\f[R]) and
+\f[B]-f\f[R] (\f[B]--file\f[R]) arguments cause dc(1) to execute them
 and exit.
 The reason for this is that this dc(1) allows users to set arguments in
 the environment variable \f[B]DC_ENV_ARGS\f[R] (see the \f[B]ENVIRONMENT
@@ -72,13 +71,13 @@ argument or define the environment variable \f[B]DC_EXPR_EXIT\f[R].
 .PP
 The following are the options that dc(1) accepts.
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -86,14 +85,14 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 This option is a no-op.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-x\f[R] \f[B]\[en]extended-register\f[R]
+\f[B]-x\f[R] \f[B]--extended-register\f[R]
 Enables extended register mode.
 See the \f[I]Extended Register Mode\f[R] subsection of the
 \f[B]REGISTERS\f[R] section for more information.
@@ -102,7 +101,7 @@ See the \f[I]Extended Register Mode\f[R] subsection of the
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -111,26 +110,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]DC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -139,6 +148,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other dc(1) implementations, this dc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -819,7 +831,7 @@ Unlike most other dc(1) implentations, this dc(1) provides nearly
 unlimited amounts of registers, if extended register mode is enabled.
 .PP
 If extended register mode is enabled (\f[B]-x\f[R] or
-\f[B]\[en]extended-register\f[R] command-line arguments are given), then
+\f[B]--extended-register\f[R] command-line arguments are given), then
 normal single character registers are used \f[I]unless\f[R] the
 character immediately following a command that needs a register name is
 a space (according to \f[B]isspace()\f[R]) and not a newline
@@ -954,7 +966,7 @@ will be correctly parsed, but the string \f[B]\[lq]/home/gavin/some
 The quote parsing will handle either kind of quotes, \f[B]\[cq]\f[R] or
 \f[B]\[lq]\f[R]. Thus, if you have a file with any number of single
 quotes in the name, you can use double quotes as the outside quotes, as
-in \f[B]\[rq]some `bc' file.bc\[dq]\f[R], and vice versa if you have a
+in \f[B]\[rq]some `dc' file.dc\[dq]\f[R], and vice versa if you have a
 file with double quotes.
 However, handling a file with both kinds of quotes in
 \f[B]DC_ENV_ARGS\f[R] is not supported due to the complexity of the
@@ -1034,17 +1046,17 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 dc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, dc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,7 +34,7 @@ dc - arbitrary-precision decimal reverse-Polish notation calculator

 # SYNOPSIS

-**dc** [**-hiPvVx**] [**--version**] [**--help**] [**--interactive**] [**--no-prompt**] [**--extended-register**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...] [*file*...]
+**dc** [**-hiPvVx**] [**-\-version**] [**-\-help**] [**-\-interactive**] [**-\-no-prompt**] [**-\-extended-register**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -43,11 +43,11 @@ notation) to store numbers and results of computations. Arithmetic operations
 pop arguments off of the stack and push the results.

 If no files are given on the command-line as extra arguments (i.e., not as
-**-f** or **--file** arguments), then dc(1) reads from **stdin**. Otherwise,
+**-f** or **-\-file** arguments), then dc(1) reads from **stdin**. Otherwise,
 those files are processed, and dc(1) will then exit.

 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where **-e** (**--expression**) and **-f** (**--file**)
+implementations, where **-e** (**-\-expression**) and **-f** (**-\-file**)
 arguments cause dc(1) to execute them and exit. The reason for this is that this
 dc(1) allows users to set arguments in the environment variable **DC_ENV_ARGS**
 (see the **ENVIRONMENT VARIABLES** section). Any expressions given on the
@@ -64,55 +64,62 @@ as the last command-line argument or define the environment variable

 The following are the options that dc(1) accepts.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   This option is a no-op.

    This is a **non-portable extension**.

-**-x** **--extended-register**
+**-x** **-\-extended-register**

 :   Enables extended register mode. See the *Extended Register Mode* subsection
    of the **REGISTERS** section for more information.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **DC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -120,7 +127,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other dc(1) implementations, this dc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -737,7 +746,7 @@ follows any command that needs a register name. The only exception is a newline
 Unlike most other dc(1) implentations, this dc(1) provides nearly unlimited
 amounts of registers, if extended register mode is enabled.

-If extended register mode is enabled (**-x** or **--extended-register**
+If extended register mode is enabled (**-x** or **-\-extended-register**
 command-line arguments are given), then normal single character registers are
 used *unless* the character immediately following a command that needs a
 register name is a space (according to **isspace()**) and not a newline
@@ -865,7 +874,7 @@ dc(1) recognizes the following environment variables:

    The quote parsing will handle either kind of quotes, **'** or **"**. Thus,
    if you have a file with any number of single quotes in the name, you can use
-    double quotes as the outside quotes, as in **"some 'bc' file.bc"**, and vice
+    double quotes as the outside quotes, as in **"some 'dc' file.dc"**, and vice
    versa if you have a file with double quotes. However, handling a file with
    both kinds of quotes in **DC_ENV_ARGS** is not supported due to the
    complexity of the parsing, though such files are still supported on the
@@ -939,17 +948,17 @@ The other statuses will only be returned when dc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since dc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, dc(1) attempts to recover from errors (see the **RESET**
@@ -25,18 +25,17 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "DC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "DC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH Name
 .PP
 dc - arbitrary-precision decimal reverse-Polish notation calculator
 .SH SYNOPSIS
 .PP
-\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]\[en]version\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]no-prompt\f[R]] [\f[B]\[en]extended-register\f[R]]
-[\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]--version\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--no-prompt\f[R]]
+[\f[B]--extended-register\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -47,13 +46,13 @@ Arithmetic operations pop arguments off of the stack and push the
 results.
 .PP
 If no files are given on the command-line as extra arguments (i.e., not
-as \f[B]-f\f[R] or \f[B]\[en]file\f[R] arguments), then dc(1) reads from
+as \f[B]-f\f[R] or \f[B]--file\f[R] arguments), then dc(1) reads from
 \f[B]stdin\f[R].
 Otherwise, those files are processed, and dc(1) will then exit.
 .PP
 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where \f[B]-e\f[R] (\f[B]\[en]expression\f[R]) and
-\f[B]-f\f[R] (\f[B]\[en]file\f[R]) arguments cause dc(1) to execute them
+implementations, where \f[B]-e\f[R] (\f[B]--expression\f[R]) and
+\f[B]-f\f[R] (\f[B]--file\f[R]) arguments cause dc(1) to execute them
 and exit.
 The reason for this is that this dc(1) allows users to set arguments in
 the environment variable \f[B]DC_ENV_ARGS\f[R] (see the \f[B]ENVIRONMENT
@@ -72,13 +71,13 @@ argument or define the environment variable \f[B]DC_EXPR_EXIT\f[R].
 .PP
 The following are the options that dc(1) accepts.
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -86,14 +85,14 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 This option is a no-op.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-x\f[R] \f[B]\[en]extended-register\f[R]
+\f[B]-x\f[R] \f[B]--extended-register\f[R]
 Enables extended register mode.
 See the \f[I]Extended Register Mode\f[R] subsection of the
 \f[B]REGISTERS\f[R] section for more information.
@@ -102,7 +101,7 @@ See the \f[I]Extended Register Mode\f[R] subsection of the
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -111,26 +110,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]DC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -139,6 +148,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other dc(1) implementations, this dc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -819,7 +831,7 @@ Unlike most other dc(1) implentations, this dc(1) provides nearly
 unlimited amounts of registers, if extended register mode is enabled.
 .PP
 If extended register mode is enabled (\f[B]-x\f[R] or
-\f[B]\[en]extended-register\f[R] command-line arguments are given), then
+\f[B]--extended-register\f[R] command-line arguments are given), then
 normal single character registers are used \f[I]unless\f[R] the
 character immediately following a command that needs a register name is
 a space (according to \f[B]isspace()\f[R]) and not a newline
@@ -954,7 +966,7 @@ will be correctly parsed, but the string \f[B]\[lq]/home/gavin/some
 The quote parsing will handle either kind of quotes, \f[B]\[cq]\f[R] or
 \f[B]\[lq]\f[R]. Thus, if you have a file with any number of single
 quotes in the name, you can use double quotes as the outside quotes, as
-in \f[B]\[rq]some `bc' file.bc\[dq]\f[R], and vice versa if you have a
+in \f[B]\[rq]some `dc' file.dc\[dq]\f[R], and vice versa if you have a
 file with double quotes.
 However, handling a file with both kinds of quotes in
 \f[B]DC_ENV_ARGS\f[R] is not supported due to the complexity of the
@@ -1034,17 +1046,17 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 dc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, dc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,7 +34,7 @@ dc - arbitrary-precision decimal reverse-Polish notation calculator

 # SYNOPSIS

-**dc** [**-hiPvVx**] [**--version**] [**--help**] [**--interactive**] [**--no-prompt**] [**--extended-register**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...] [*file*...]
+**dc** [**-hiPvVx**] [**-\-version**] [**-\-help**] [**-\-interactive**] [**-\-no-prompt**] [**-\-extended-register**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -43,11 +43,11 @@ notation) to store numbers and results of computations. Arithmetic operations
 pop arguments off of the stack and push the results.

 If no files are given on the command-line as extra arguments (i.e., not as
-**-f** or **--file** arguments), then dc(1) reads from **stdin**. Otherwise,
+**-f** or **-\-file** arguments), then dc(1) reads from **stdin**. Otherwise,
 those files are processed, and dc(1) will then exit.

 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where **-e** (**--expression**) and **-f** (**--file**)
+implementations, where **-e** (**-\-expression**) and **-f** (**-\-file**)
 arguments cause dc(1) to execute them and exit. The reason for this is that this
 dc(1) allows users to set arguments in the environment variable **DC_ENV_ARGS**
 (see the **ENVIRONMENT VARIABLES** section). Any expressions given on the
@@ -64,55 +64,62 @@ as the last command-line argument or define the environment variable

 The following are the options that dc(1) accepts.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   This option is a no-op.

    This is a **non-portable extension**.

-**-x** **--extended-register**
+**-x** **-\-extended-register**

 :   Enables extended register mode. See the *Extended Register Mode* subsection
    of the **REGISTERS** section for more information.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **DC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -120,7 +127,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other dc(1) implementations, this dc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -737,7 +746,7 @@ follows any command that needs a register name. The only exception is a newline
 Unlike most other dc(1) implentations, this dc(1) provides nearly unlimited
 amounts of registers, if extended register mode is enabled.

-If extended register mode is enabled (**-x** or **--extended-register**
+If extended register mode is enabled (**-x** or **-\-extended-register**
 command-line arguments are given), then normal single character registers are
 used *unless* the character immediately following a command that needs a
 register name is a space (according to **isspace()**) and not a newline
@@ -865,7 +874,7 @@ dc(1) recognizes the following environment variables:

    The quote parsing will handle either kind of quotes, **'** or **"**. Thus,
    if you have a file with any number of single quotes in the name, you can use
-    double quotes as the outside quotes, as in **"some 'bc' file.bc"**, and vice
+    double quotes as the outside quotes, as in **"some 'dc' file.dc"**, and vice
    versa if you have a file with double quotes. However, handling a file with
    both kinds of quotes in **DC_ENV_ARGS** is not supported due to the
    complexity of the parsing, though such files are still supported on the
@@ -939,17 +948,17 @@ The other statuses will only be returned when dc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since dc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, dc(1) attempts to recover from errors (see the **RESET**
@@ -25,18 +25,17 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "DC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "DC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH Name
 .PP
 dc - arbitrary-precision decimal reverse-Polish notation calculator
 .SH SYNOPSIS
 .PP
-\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]\[en]version\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]no-prompt\f[R]] [\f[B]\[en]extended-register\f[R]]
-[\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]--version\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--no-prompt\f[R]]
+[\f[B]--extended-register\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -47,13 +46,13 @@ Arithmetic operations pop arguments off of the stack and push the
 results.
 .PP
 If no files are given on the command-line as extra arguments (i.e., not
-as \f[B]-f\f[R] or \f[B]\[en]file\f[R] arguments), then dc(1) reads from
+as \f[B]-f\f[R] or \f[B]--file\f[R] arguments), then dc(1) reads from
 \f[B]stdin\f[R].
 Otherwise, those files are processed, and dc(1) will then exit.
 .PP
 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where \f[B]-e\f[R] (\f[B]\[en]expression\f[R]) and
-\f[B]-f\f[R] (\f[B]\[en]file\f[R]) arguments cause dc(1) to execute them
+implementations, where \f[B]-e\f[R] (\f[B]--expression\f[R]) and
+\f[B]-f\f[R] (\f[B]--file\f[R]) arguments cause dc(1) to execute them
 and exit.
 The reason for this is that this dc(1) allows users to set arguments in
 the environment variable \f[B]DC_ENV_ARGS\f[R] (see the \f[B]ENVIRONMENT
@@ -72,13 +71,13 @@ argument or define the environment variable \f[B]DC_EXPR_EXIT\f[R].
 .PP
 The following are the options that dc(1) accepts.
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -86,7 +85,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 Disables the prompt in TTY mode.
 (The prompt is only enabled in TTY mode.
 See the \f[B]TTY MODE\f[R] section) This is mostly for those users that
@@ -98,7 +97,7 @@ Most of those users would want to put this option in
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-x\f[R] \f[B]\[en]extended-register\f[R]
+\f[B]-x\f[R] \f[B]--extended-register\f[R]
 Enables extended register mode.
 See the \f[I]Extended Register Mode\f[R] subsection of the
 \f[B]REGISTERS\f[R] section for more information.
@@ -107,7 +106,7 @@ See the \f[I]Extended Register Mode\f[R] subsection of the
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -116,26 +115,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]DC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -144,6 +153,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other dc(1) implementations, this dc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -824,7 +836,7 @@ Unlike most other dc(1) implentations, this dc(1) provides nearly
 unlimited amounts of registers, if extended register mode is enabled.
 .PP
 If extended register mode is enabled (\f[B]-x\f[R] or
-\f[B]\[en]extended-register\f[R] command-line arguments are given), then
+\f[B]--extended-register\f[R] command-line arguments are given), then
 normal single character registers are used \f[I]unless\f[R] the
 character immediately following a command that needs a register name is
 a space (according to \f[B]isspace()\f[R]) and not a newline
@@ -959,7 +971,7 @@ will be correctly parsed, but the string \f[B]\[lq]/home/gavin/some
 The quote parsing will handle either kind of quotes, \f[B]\[cq]\f[R] or
 \f[B]\[lq]\f[R]. Thus, if you have a file with any number of single
 quotes in the name, you can use double quotes as the outside quotes, as
-in \f[B]\[rq]some `bc' file.bc\[dq]\f[R], and vice versa if you have a
+in \f[B]\[rq]some `dc' file.dc\[dq]\f[R], and vice versa if you have a
 file with double quotes.
 However, handling a file with both kinds of quotes in
 \f[B]DC_ENV_ARGS\f[R] is not supported due to the complexity of the
@@ -1039,17 +1051,17 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 dc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, dc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,7 +34,7 @@ dc - arbitrary-precision decimal reverse-Polish notation calculator

 # SYNOPSIS

-**dc** [**-hiPvVx**] [**--version**] [**--help**] [**--interactive**] [**--no-prompt**] [**--extended-register**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...] [*file*...]
+**dc** [**-hiPvVx**] [**-\-version**] [**-\-help**] [**-\-interactive**] [**-\-no-prompt**] [**-\-extended-register**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -43,11 +43,11 @@ notation) to store numbers and results of computations. Arithmetic operations
 pop arguments off of the stack and push the results.

 If no files are given on the command-line as extra arguments (i.e., not as
-**-f** or **--file** arguments), then dc(1) reads from **stdin**. Otherwise,
+**-f** or **-\-file** arguments), then dc(1) reads from **stdin**. Otherwise,
 those files are processed, and dc(1) will then exit.

 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where **-e** (**--expression**) and **-f** (**--file**)
+implementations, where **-e** (**-\-expression**) and **-f** (**-\-file**)
 arguments cause dc(1) to execute them and exit. The reason for this is that this
 dc(1) allows users to set arguments in the environment variable **DC_ENV_ARGS**
 (see the **ENVIRONMENT VARIABLES** section). Any expressions given on the
@@ -64,21 +64,21 @@ as the last command-line argument or define the environment variable

 The following are the options that dc(1) accepts.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   Disables the prompt in TTY mode. (The prompt is only enabled in TTY mode.
    See the **TTY MODE** section) This is mostly for those users that do not
@@ -87,35 +87,42 @@ The following are the options that dc(1) accepts.

    This is a **non-portable extension**.

-**-x** **--extended-register**
+**-x** **-\-extended-register**

 :   Enables extended register mode. See the *Extended Register Mode* subsection
    of the **REGISTERS** section for more information.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **DC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -123,7 +130,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other dc(1) implementations, this dc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -740,7 +749,7 @@ follows any command that needs a register name. The only exception is a newline
 Unlike most other dc(1) implentations, this dc(1) provides nearly unlimited
 amounts of registers, if extended register mode is enabled.

-If extended register mode is enabled (**-x** or **--extended-register**
+If extended register mode is enabled (**-x** or **-\-extended-register**
 command-line arguments are given), then normal single character registers are
 used *unless* the character immediately following a command that needs a
 register name is a space (according to **isspace()**) and not a newline
@@ -868,7 +877,7 @@ dc(1) recognizes the following environment variables:

    The quote parsing will handle either kind of quotes, **'** or **"**. Thus,
    if you have a file with any number of single quotes in the name, you can use
-    double quotes as the outside quotes, as in **"some 'bc' file.bc"**, and vice
+    double quotes as the outside quotes, as in **"some 'dc' file.dc"**, and vice
    versa if you have a file with double quotes. However, handling a file with
    both kinds of quotes in **DC_ENV_ARGS** is not supported due to the
    complexity of the parsing, though such files are still supported on the
@@ -942,17 +951,17 @@ The other statuses will only be returned when dc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since dc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, dc(1) attempts to recover from errors (see the **RESET**
@@ -25,18 +25,17 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "DC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "DC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH Name
 .PP
 dc - arbitrary-precision decimal reverse-Polish notation calculator
 .SH SYNOPSIS
 .PP
-\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]\[en]version\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]no-prompt\f[R]] [\f[B]\[en]extended-register\f[R]]
-[\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]--version\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--no-prompt\f[R]]
+[\f[B]--extended-register\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -47,13 +46,13 @@ Arithmetic operations pop arguments off of the stack and push the
 results.
 .PP
 If no files are given on the command-line as extra arguments (i.e., not
-as \f[B]-f\f[R] or \f[B]\[en]file\f[R] arguments), then dc(1) reads from
+as \f[B]-f\f[R] or \f[B]--file\f[R] arguments), then dc(1) reads from
 \f[B]stdin\f[R].
 Otherwise, those files are processed, and dc(1) will then exit.
 .PP
 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where \f[B]-e\f[R] (\f[B]\[en]expression\f[R]) and
-\f[B]-f\f[R] (\f[B]\[en]file\f[R]) arguments cause dc(1) to execute them
+implementations, where \f[B]-e\f[R] (\f[B]--expression\f[R]) and
+\f[B]-f\f[R] (\f[B]--file\f[R]) arguments cause dc(1) to execute them
 and exit.
 The reason for this is that this dc(1) allows users to set arguments in
 the environment variable \f[B]DC_ENV_ARGS\f[R] (see the \f[B]ENVIRONMENT
@@ -72,13 +71,13 @@ argument or define the environment variable \f[B]DC_EXPR_EXIT\f[R].
 .PP
 The following are the options that dc(1) accepts.
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -86,14 +85,14 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 This option is a no-op.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-x\f[R] \f[B]\[en]extended-register\f[R]
+\f[B]-x\f[R] \f[B]--extended-register\f[R]
 Enables extended register mode.
 See the \f[I]Extended Register Mode\f[R] subsection of the
 \f[B]REGISTERS\f[R] section for more information.
@@ -102,7 +101,7 @@ See the \f[I]Extended Register Mode\f[R] subsection of the
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -111,26 +110,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]DC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -139,6 +148,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other dc(1) implementations, this dc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -819,7 +831,7 @@ Unlike most other dc(1) implentations, this dc(1) provides nearly
 unlimited amounts of registers, if extended register mode is enabled.
 .PP
 If extended register mode is enabled (\f[B]-x\f[R] or
-\f[B]\[en]extended-register\f[R] command-line arguments are given), then
+\f[B]--extended-register\f[R] command-line arguments are given), then
 normal single character registers are used \f[I]unless\f[R] the
 character immediately following a command that needs a register name is
 a space (according to \f[B]isspace()\f[R]) and not a newline
@@ -954,7 +966,7 @@ will be correctly parsed, but the string \f[B]\[lq]/home/gavin/some
 The quote parsing will handle either kind of quotes, \f[B]\[cq]\f[R] or
 \f[B]\[lq]\f[R]. Thus, if you have a file with any number of single
 quotes in the name, you can use double quotes as the outside quotes, as
-in \f[B]\[rq]some `bc' file.bc\[dq]\f[R], and vice versa if you have a
+in \f[B]\[rq]some `dc' file.dc\[dq]\f[R], and vice versa if you have a
 file with double quotes.
 However, handling a file with both kinds of quotes in
 \f[B]DC_ENV_ARGS\f[R] is not supported due to the complexity of the
@@ -1034,17 +1046,17 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 dc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, dc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,7 +34,7 @@ dc - arbitrary-precision decimal reverse-Polish notation calculator

 # SYNOPSIS

-**dc** [**-hiPvVx**] [**--version**] [**--help**] [**--interactive**] [**--no-prompt**] [**--extended-register**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...] [*file*...]
+**dc** [**-hiPvVx**] [**-\-version**] [**-\-help**] [**-\-interactive**] [**-\-no-prompt**] [**-\-extended-register**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -43,11 +43,11 @@ notation) to store numbers and results of computations. Arithmetic operations
 pop arguments off of the stack and push the results.

 If no files are given on the command-line as extra arguments (i.e., not as
-**-f** or **--file** arguments), then dc(1) reads from **stdin**. Otherwise,
+**-f** or **-\-file** arguments), then dc(1) reads from **stdin**. Otherwise,
 those files are processed, and dc(1) will then exit.

 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where **-e** (**--expression**) and **-f** (**--file**)
+implementations, where **-e** (**-\-expression**) and **-f** (**-\-file**)
 arguments cause dc(1) to execute them and exit. The reason for this is that this
 dc(1) allows users to set arguments in the environment variable **DC_ENV_ARGS**
 (see the **ENVIRONMENT VARIABLES** section). Any expressions given on the
@@ -64,55 +64,62 @@ as the last command-line argument or define the environment variable

 The following are the options that dc(1) accepts.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   This option is a no-op.

    This is a **non-portable extension**.

-**-x** **--extended-register**
+**-x** **-\-extended-register**

 :   Enables extended register mode. See the *Extended Register Mode* subsection
    of the **REGISTERS** section for more information.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **DC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -120,7 +127,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other dc(1) implementations, this dc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -737,7 +746,7 @@ follows any command that needs a register name. The only exception is a newline
 Unlike most other dc(1) implentations, this dc(1) provides nearly unlimited
 amounts of registers, if extended register mode is enabled.

-If extended register mode is enabled (**-x** or **--extended-register**
+If extended register mode is enabled (**-x** or **-\-extended-register**
 command-line arguments are given), then normal single character registers are
 used *unless* the character immediately following a command that needs a
 register name is a space (according to **isspace()**) and not a newline
@@ -865,7 +874,7 @@ dc(1) recognizes the following environment variables:

    The quote parsing will handle either kind of quotes, **'** or **"**. Thus,
    if you have a file with any number of single quotes in the name, you can use
-    double quotes as the outside quotes, as in **"some 'bc' file.bc"**, and vice
+    double quotes as the outside quotes, as in **"some 'dc' file.dc"**, and vice
    versa if you have a file with double quotes. However, handling a file with
    both kinds of quotes in **DC_ENV_ARGS** is not supported due to the
    complexity of the parsing, though such files are still supported on the
@@ -939,17 +948,17 @@ The other statuses will only be returned when dc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since dc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, dc(1) attempts to recover from errors (see the **RESET**
@@ -25,18 +25,17 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "DC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "DC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH Name
 .PP
 dc - arbitrary-precision decimal reverse-Polish notation calculator
 .SH SYNOPSIS
 .PP
-\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]\[en]version\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]no-prompt\f[R]] [\f[B]\[en]extended-register\f[R]]
-[\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]--version\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--no-prompt\f[R]]
+[\f[B]--extended-register\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -47,13 +46,13 @@ Arithmetic operations pop arguments off of the stack and push the
 results.
 .PP
 If no files are given on the command-line as extra arguments (i.e., not
-as \f[B]-f\f[R] or \f[B]\[en]file\f[R] arguments), then dc(1) reads from
+as \f[B]-f\f[R] or \f[B]--file\f[R] arguments), then dc(1) reads from
 \f[B]stdin\f[R].
 Otherwise, those files are processed, and dc(1) will then exit.
 .PP
 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where \f[B]-e\f[R] (\f[B]\[en]expression\f[R]) and
-\f[B]-f\f[R] (\f[B]\[en]file\f[R]) arguments cause dc(1) to execute them
+implementations, where \f[B]-e\f[R] (\f[B]--expression\f[R]) and
+\f[B]-f\f[R] (\f[B]--file\f[R]) arguments cause dc(1) to execute them
 and exit.
 The reason for this is that this dc(1) allows users to set arguments in
 the environment variable \f[B]DC_ENV_ARGS\f[R] (see the \f[B]ENVIRONMENT
@@ -72,13 +71,13 @@ argument or define the environment variable \f[B]DC_EXPR_EXIT\f[R].
 .PP
 The following are the options that dc(1) accepts.
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -86,14 +85,14 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 This option is a no-op.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-x\f[R] \f[B]\[en]extended-register\f[R]
+\f[B]-x\f[R] \f[B]--extended-register\f[R]
 Enables extended register mode.
 See the \f[I]Extended Register Mode\f[R] subsection of the
 \f[B]REGISTERS\f[R] section for more information.
@@ -102,7 +101,7 @@ See the \f[I]Extended Register Mode\f[R] subsection of the
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -111,26 +110,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]DC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -139,6 +148,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other dc(1) implementations, this dc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -819,7 +831,7 @@ Unlike most other dc(1) implentations, this dc(1) provides nearly
 unlimited amounts of registers, if extended register mode is enabled.
 .PP
 If extended register mode is enabled (\f[B]-x\f[R] or
-\f[B]\[en]extended-register\f[R] command-line arguments are given), then
+\f[B]--extended-register\f[R] command-line arguments are given), then
 normal single character registers are used \f[I]unless\f[R] the
 character immediately following a command that needs a register name is
 a space (according to \f[B]isspace()\f[R]) and not a newline
@@ -954,7 +966,7 @@ will be correctly parsed, but the string \f[B]\[lq]/home/gavin/some
 The quote parsing will handle either kind of quotes, \f[B]\[cq]\f[R] or
 \f[B]\[lq]\f[R]. Thus, if you have a file with any number of single
 quotes in the name, you can use double quotes as the outside quotes, as
-in \f[B]\[rq]some `bc' file.bc\[dq]\f[R], and vice versa if you have a
+in \f[B]\[rq]some `dc' file.dc\[dq]\f[R], and vice versa if you have a
 file with double quotes.
 However, handling a file with both kinds of quotes in
 \f[B]DC_ENV_ARGS\f[R] is not supported due to the complexity of the
@@ -1034,17 +1046,17 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 dc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, dc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,7 +34,7 @@ dc - arbitrary-precision decimal reverse-Polish notation calculator

 # SYNOPSIS

-**dc** [**-hiPvVx**] [**--version**] [**--help**] [**--interactive**] [**--no-prompt**] [**--extended-register**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...] [*file*...]
+**dc** [**-hiPvVx**] [**-\-version**] [**-\-help**] [**-\-interactive**] [**-\-no-prompt**] [**-\-extended-register**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -43,11 +43,11 @@ notation) to store numbers and results of computations. Arithmetic operations
 pop arguments off of the stack and push the results.

 If no files are given on the command-line as extra arguments (i.e., not as
-**-f** or **--file** arguments), then dc(1) reads from **stdin**. Otherwise,
+**-f** or **-\-file** arguments), then dc(1) reads from **stdin**. Otherwise,
 those files are processed, and dc(1) will then exit.

 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where **-e** (**--expression**) and **-f** (**--file**)
+implementations, where **-e** (**-\-expression**) and **-f** (**-\-file**)
 arguments cause dc(1) to execute them and exit. The reason for this is that this
 dc(1) allows users to set arguments in the environment variable **DC_ENV_ARGS**
 (see the **ENVIRONMENT VARIABLES** section). Any expressions given on the
@@ -64,55 +64,62 @@ as the last command-line argument or define the environment variable

 The following are the options that dc(1) accepts.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   This option is a no-op.

    This is a **non-portable extension**.

-**-x** **--extended-register**
+**-x** **-\-extended-register**

 :   Enables extended register mode. See the *Extended Register Mode* subsection
    of the **REGISTERS** section for more information.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **DC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -120,7 +127,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other dc(1) implementations, this dc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -737,7 +746,7 @@ follows any command that needs a register name. The only exception is a newline
 Unlike most other dc(1) implentations, this dc(1) provides nearly unlimited
 amounts of registers, if extended register mode is enabled.

-If extended register mode is enabled (**-x** or **--extended-register**
+If extended register mode is enabled (**-x** or **-\-extended-register**
 command-line arguments are given), then normal single character registers are
 used *unless* the character immediately following a command that needs a
 register name is a space (according to **isspace()**) and not a newline
@@ -865,7 +874,7 @@ dc(1) recognizes the following environment variables:

    The quote parsing will handle either kind of quotes, **'** or **"**. Thus,
    if you have a file with any number of single quotes in the name, you can use
-    double quotes as the outside quotes, as in **"some 'bc' file.bc"**, and vice
+    double quotes as the outside quotes, as in **"some 'dc' file.dc"**, and vice
    versa if you have a file with double quotes. However, handling a file with
    both kinds of quotes in **DC_ENV_ARGS** is not supported due to the
    complexity of the parsing, though such files are still supported on the
@@ -939,17 +948,17 @@ The other statuses will only be returned when dc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since dc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, dc(1) attempts to recover from errors (see the **RESET**
@@ -25,18 +25,17 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "DC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "DC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH Name
 .PP
 dc - arbitrary-precision decimal reverse-Polish notation calculator
 .SH SYNOPSIS
 .PP
-\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]\[en]version\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]no-prompt\f[R]] [\f[B]\[en]extended-register\f[R]]
-[\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]--version\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--no-prompt\f[R]]
+[\f[B]--extended-register\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -47,13 +46,13 @@ Arithmetic operations pop arguments off of the stack and push the
 results.
 .PP
 If no files are given on the command-line as extra arguments (i.e., not
-as \f[B]-f\f[R] or \f[B]\[en]file\f[R] arguments), then dc(1) reads from
+as \f[B]-f\f[R] or \f[B]--file\f[R] arguments), then dc(1) reads from
 \f[B]stdin\f[R].
 Otherwise, those files are processed, and dc(1) will then exit.
 .PP
 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where \f[B]-e\f[R] (\f[B]\[en]expression\f[R]) and
-\f[B]-f\f[R] (\f[B]\[en]file\f[R]) arguments cause dc(1) to execute them
+implementations, where \f[B]-e\f[R] (\f[B]--expression\f[R]) and
+\f[B]-f\f[R] (\f[B]--file\f[R]) arguments cause dc(1) to execute them
 and exit.
 The reason for this is that this dc(1) allows users to set arguments in
 the environment variable \f[B]DC_ENV_ARGS\f[R] (see the \f[B]ENVIRONMENT
@@ -72,13 +71,13 @@ argument or define the environment variable \f[B]DC_EXPR_EXIT\f[R].
 .PP
 The following are the options that dc(1) accepts.
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -86,7 +85,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 Disables the prompt in TTY mode.
 (The prompt is only enabled in TTY mode.
 See the \f[B]TTY MODE\f[R] section) This is mostly for those users that
@@ -98,7 +97,7 @@ Most of those users would want to put this option in
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-x\f[R] \f[B]\[en]extended-register\f[R]
+\f[B]-x\f[R] \f[B]--extended-register\f[R]
 Enables extended register mode.
 See the \f[I]Extended Register Mode\f[R] subsection of the
 \f[B]REGISTERS\f[R] section for more information.
@@ -107,7 +106,7 @@ See the \f[I]Extended Register Mode\f[R] subsection of the
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -116,26 +115,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]DC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -144,6 +153,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other dc(1) implementations, this dc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -235,7 +247,7 @@ guaranteed to \f[B]NOT\f[R] be cryptographically secure.
 This is a consequence of using a seeded pseudo-random number generator.
 However, they \f[I]are\f[R] guaranteed to be reproducible with identical
 \f[B]seed\f[R] values.
-This means that the pseudo-random values from bc(1) should only be used
+This means that the pseudo-random values from dc(1) should only be used
 where a reproducible stream of pseudo-random numbers is
 \f[I]ESSENTIAL\f[R].
 In any other case, use a non-seeded pseudo-random number generator.
@@ -1024,7 +1036,7 @@ Unlike most other dc(1) implentations, this dc(1) provides nearly
 unlimited amounts of registers, if extended register mode is enabled.
 .PP
 If extended register mode is enabled (\f[B]-x\f[R] or
-\f[B]\[en]extended-register\f[R] command-line arguments are given), then
+\f[B]--extended-register\f[R] command-line arguments are given), then
 normal single character registers are used \f[I]unless\f[R] the
 character immediately following a command that needs a register name is
 a space (according to \f[B]isspace()\f[R]) and not a newline
@@ -1164,7 +1176,7 @@ will be correctly parsed, but the string \f[B]\[lq]/home/gavin/some
 The quote parsing will handle either kind of quotes, \f[B]\[cq]\f[R] or
 \f[B]\[lq]\f[R]. Thus, if you have a file with any number of single
 quotes in the name, you can use double quotes as the outside quotes, as
-in \f[B]\[rq]some `bc' file.bc\[dq]\f[R], and vice versa if you have a
+in \f[B]\[rq]some `dc' file.dc\[dq]\f[R], and vice versa if you have a
 file with double quotes.
 However, handling a file with both kinds of quotes in
 \f[B]DC_ENV_ARGS\f[R] is not supported due to the complexity of the
@@ -1247,17 +1259,17 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 dc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, dc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,7 +34,7 @@ dc - arbitrary-precision decimal reverse-Polish notation calculator

 # SYNOPSIS

-**dc** [**-hiPvVx**] [**--version**] [**--help**] [**--interactive**] [**--no-prompt**] [**--extended-register**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...] [*file*...]
+**dc** [**-hiPvVx**] [**-\-version**] [**-\-help**] [**-\-interactive**] [**-\-no-prompt**] [**-\-extended-register**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -43,11 +43,11 @@ notation) to store numbers and results of computations. Arithmetic operations
 pop arguments off of the stack and push the results.

 If no files are given on the command-line as extra arguments (i.e., not as
-**-f** or **--file** arguments), then dc(1) reads from **stdin**. Otherwise,
+**-f** or **-\-file** arguments), then dc(1) reads from **stdin**. Otherwise,
 those files are processed, and dc(1) will then exit.

 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where **-e** (**--expression**) and **-f** (**--file**)
+implementations, where **-e** (**-\-expression**) and **-f** (**-\-file**)
 arguments cause dc(1) to execute them and exit. The reason for this is that this
 dc(1) allows users to set arguments in the environment variable **DC_ENV_ARGS**
 (see the **ENVIRONMENT VARIABLES** section). Any expressions given on the
@@ -64,21 +64,21 @@ as the last command-line argument or define the environment variable

 The following are the options that dc(1) accepts.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   Disables the prompt in TTY mode. (The prompt is only enabled in TTY mode.
    See the **TTY MODE** section) This is mostly for those users that do not
@@ -87,35 +87,42 @@ The following are the options that dc(1) accepts.

    This is a **non-portable extension**.

-**-x** **--extended-register**
+**-x** **-\-extended-register**

 :   Enables extended register mode. See the *Extended Register Mode* subsection
    of the **REGISTERS** section for more information.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **DC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -123,7 +130,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other dc(1) implementations, this dc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -198,7 +207,7 @@ command or the **"** command that does not get receive a value of **0** or
 **'** and **"** commands are guaranteed to **NOT** be cryptographically secure.
 This is a consequence of using a seeded pseudo-random number generator. However,
 they *are* guaranteed to be reproducible with identical **seed** values. This
-means that the pseudo-random values from bc(1) should only be used where a
+means that the pseudo-random values from dc(1) should only be used where a
 reproducible stream of pseudo-random numbers is *ESSENTIAL*. In any other case,
 use a non-seeded pseudo-random number generator.

@@ -900,7 +909,7 @@ follows any command that needs a register name. The only exception is a newline
 Unlike most other dc(1) implentations, this dc(1) provides nearly unlimited
 amounts of registers, if extended register mode is enabled.

-If extended register mode is enabled (**-x** or **--extended-register**
+If extended register mode is enabled (**-x** or **-\-extended-register**
 command-line arguments are given), then normal single character registers are
 used *unless* the character immediately following a command that needs a
 register name is a space (according to **isspace()**) and not a newline
@@ -1033,7 +1042,7 @@ dc(1) recognizes the following environment variables:

    The quote parsing will handle either kind of quotes, **'** or **"**. Thus,
    if you have a file with any number of single quotes in the name, you can use
-    double quotes as the outside quotes, as in **"some 'bc' file.bc"**, and vice
+    double quotes as the outside quotes, as in **"some 'dc' file.dc"**, and vice
    versa if you have a file with double quotes. However, handling a file with
    both kinds of quotes in **DC_ENV_ARGS** is not supported due to the
    complexity of the parsing, though such files are still supported on the
@@ -1109,17 +1118,17 @@ The other statuses will only be returned when dc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since dc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, dc(1) attempts to recover from errors (see the **RESET**
@@ -25,18 +25,17 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "DC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "DC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH Name
 .PP
 dc - arbitrary-precision decimal reverse-Polish notation calculator
 .SH SYNOPSIS
 .PP
-\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]\[en]version\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]no-prompt\f[R]] [\f[B]\[en]extended-register\f[R]]
-[\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]--version\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--no-prompt\f[R]]
+[\f[B]--extended-register\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -47,13 +46,13 @@ Arithmetic operations pop arguments off of the stack and push the
 results.
 .PP
 If no files are given on the command-line as extra arguments (i.e., not
-as \f[B]-f\f[R] or \f[B]\[en]file\f[R] arguments), then dc(1) reads from
+as \f[B]-f\f[R] or \f[B]--file\f[R] arguments), then dc(1) reads from
 \f[B]stdin\f[R].
 Otherwise, those files are processed, and dc(1) will then exit.
 .PP
 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where \f[B]-e\f[R] (\f[B]\[en]expression\f[R]) and
-\f[B]-f\f[R] (\f[B]\[en]file\f[R]) arguments cause dc(1) to execute them
+implementations, where \f[B]-e\f[R] (\f[B]--expression\f[R]) and
+\f[B]-f\f[R] (\f[B]--file\f[R]) arguments cause dc(1) to execute them
 and exit.
 The reason for this is that this dc(1) allows users to set arguments in
 the environment variable \f[B]DC_ENV_ARGS\f[R] (see the \f[B]ENVIRONMENT
@@ -72,13 +71,13 @@ argument or define the environment variable \f[B]DC_EXPR_EXIT\f[R].
 .PP
 The following are the options that dc(1) accepts.
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -86,7 +85,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 Disables the prompt in TTY mode.
 (The prompt is only enabled in TTY mode.
 See the \f[B]TTY MODE\f[R] section) This is mostly for those users that
@@ -98,7 +97,7 @@ Most of those users would want to put this option in
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-x\f[R] \f[B]\[en]extended-register\f[R]
+\f[B]-x\f[R] \f[B]--extended-register\f[R]
 Enables extended register mode.
 See the \f[I]Extended Register Mode\f[R] subsection of the
 \f[B]REGISTERS\f[R] section for more information.
@@ -107,7 +106,7 @@ See the \f[I]Extended Register Mode\f[R] subsection of the
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -116,26 +115,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]DC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -144,6 +153,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other dc(1) implementations, this dc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -235,7 +247,7 @@ guaranteed to \f[B]NOT\f[R] be cryptographically secure.
 This is a consequence of using a seeded pseudo-random number generator.
 However, they \f[I]are\f[R] guaranteed to be reproducible with identical
 \f[B]seed\f[R] values.
-This means that the pseudo-random values from bc(1) should only be used
+This means that the pseudo-random values from dc(1) should only be used
 where a reproducible stream of pseudo-random numbers is
 \f[I]ESSENTIAL\f[R].
 In any other case, use a non-seeded pseudo-random number generator.
@@ -1024,7 +1036,7 @@ Unlike most other dc(1) implentations, this dc(1) provides nearly
 unlimited amounts of registers, if extended register mode is enabled.
 .PP
 If extended register mode is enabled (\f[B]-x\f[R] or
-\f[B]\[en]extended-register\f[R] command-line arguments are given), then
+\f[B]--extended-register\f[R] command-line arguments are given), then
 normal single character registers are used \f[I]unless\f[R] the
 character immediately following a command that needs a register name is
 a space (according to \f[B]isspace()\f[R]) and not a newline
@@ -1164,7 +1176,7 @@ will be correctly parsed, but the string \f[B]\[lq]/home/gavin/some
 The quote parsing will handle either kind of quotes, \f[B]\[cq]\f[R] or
 \f[B]\[lq]\f[R]. Thus, if you have a file with any number of single
 quotes in the name, you can use double quotes as the outside quotes, as
-in \f[B]\[rq]some `bc' file.bc\[dq]\f[R], and vice versa if you have a
+in \f[B]\[rq]some `dc' file.dc\[dq]\f[R], and vice versa if you have a
 file with double quotes.
 However, handling a file with both kinds of quotes in
 \f[B]DC_ENV_ARGS\f[R] is not supported due to the complexity of the
@@ -1247,17 +1259,17 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 dc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, dc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,7 +34,7 @@ dc - arbitrary-precision decimal reverse-Polish notation calculator

 # SYNOPSIS

-**dc** [**-hiPvVx**] [**--version**] [**--help**] [**--interactive**] [**--no-prompt**] [**--extended-register**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...] [*file*...]
+**dc** [**-hiPvVx**] [**-\-version**] [**-\-help**] [**-\-interactive**] [**-\-no-prompt**] [**-\-extended-register**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -43,11 +43,11 @@ notation) to store numbers and results of computations. Arithmetic operations
 pop arguments off of the stack and push the results.

 If no files are given on the command-line as extra arguments (i.e., not as
-**-f** or **--file** arguments), then dc(1) reads from **stdin**. Otherwise,
+**-f** or **-\-file** arguments), then dc(1) reads from **stdin**. Otherwise,
 those files are processed, and dc(1) will then exit.

 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where **-e** (**--expression**) and **-f** (**--file**)
+implementations, where **-e** (**-\-expression**) and **-f** (**-\-file**)
 arguments cause dc(1) to execute them and exit. The reason for this is that this
 dc(1) allows users to set arguments in the environment variable **DC_ENV_ARGS**
 (see the **ENVIRONMENT VARIABLES** section). Any expressions given on the
@@ -64,21 +64,21 @@ as the last command-line argument or define the environment variable

 The following are the options that dc(1) accepts.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   Disables the prompt in TTY mode. (The prompt is only enabled in TTY mode.
    See the **TTY MODE** section) This is mostly for those users that do not
@@ -87,35 +87,42 @@ The following are the options that dc(1) accepts.

    This is a **non-portable extension**.

-**-x** **--extended-register**
+**-x** **-\-extended-register**

 :   Enables extended register mode. See the *Extended Register Mode* subsection
    of the **REGISTERS** section for more information.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **DC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -123,7 +130,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other dc(1) implementations, this dc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -198,7 +207,7 @@ command or the **"** command that does not get receive a value of **0** or
 **'** and **"** commands are guaranteed to **NOT** be cryptographically secure.
 This is a consequence of using a seeded pseudo-random number generator. However,
 they *are* guaranteed to be reproducible with identical **seed** values. This
-means that the pseudo-random values from bc(1) should only be used where a
+means that the pseudo-random values from dc(1) should only be used where a
 reproducible stream of pseudo-random numbers is *ESSENTIAL*. In any other case,
 use a non-seeded pseudo-random number generator.

@@ -900,7 +909,7 @@ follows any command that needs a register name. The only exception is a newline
 Unlike most other dc(1) implentations, this dc(1) provides nearly unlimited
 amounts of registers, if extended register mode is enabled.

-If extended register mode is enabled (**-x** or **--extended-register**
+If extended register mode is enabled (**-x** or **-\-extended-register**
 command-line arguments are given), then normal single character registers are
 used *unless* the character immediately following a command that needs a
 register name is a space (according to **isspace()**) and not a newline
@@ -1033,7 +1042,7 @@ dc(1) recognizes the following environment variables:

    The quote parsing will handle either kind of quotes, **'** or **"**. Thus,
    if you have a file with any number of single quotes in the name, you can use
-    double quotes as the outside quotes, as in **"some 'bc' file.bc"**, and vice
+    double quotes as the outside quotes, as in **"some 'dc' file.dc"**, and vice
    versa if you have a file with double quotes. However, handling a file with
    both kinds of quotes in **DC_ENV_ARGS** is not supported due to the
    complexity of the parsing, though such files are still supported on the
@@ -1109,17 +1118,17 @@ The other statuses will only be returned when dc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since dc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, dc(1) attempts to recover from errors (see the **RESET**
@@ -25,18 +25,17 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "DC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "DC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH Name
 .PP
 dc - arbitrary-precision decimal reverse-Polish notation calculator
 .SH SYNOPSIS
 .PP
-\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]\[en]version\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]no-prompt\f[R]] [\f[B]\[en]extended-register\f[R]]
-[\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]--version\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--no-prompt\f[R]]
+[\f[B]--extended-register\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -47,13 +46,13 @@ Arithmetic operations pop arguments off of the stack and push the
 results.
 .PP
 If no files are given on the command-line as extra arguments (i.e., not
-as \f[B]-f\f[R] or \f[B]\[en]file\f[R] arguments), then dc(1) reads from
+as \f[B]-f\f[R] or \f[B]--file\f[R] arguments), then dc(1) reads from
 \f[B]stdin\f[R].
 Otherwise, those files are processed, and dc(1) will then exit.
 .PP
 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where \f[B]-e\f[R] (\f[B]\[en]expression\f[R]) and
-\f[B]-f\f[R] (\f[B]\[en]file\f[R]) arguments cause dc(1) to execute them
+implementations, where \f[B]-e\f[R] (\f[B]--expression\f[R]) and
+\f[B]-f\f[R] (\f[B]--file\f[R]) arguments cause dc(1) to execute them
 and exit.
 The reason for this is that this dc(1) allows users to set arguments in
 the environment variable \f[B]DC_ENV_ARGS\f[R] (see the \f[B]ENVIRONMENT
@@ -72,13 +71,13 @@ argument or define the environment variable \f[B]DC_EXPR_EXIT\f[R].
 .PP
 The following are the options that dc(1) accepts.
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -86,14 +85,14 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 This option is a no-op.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-x\f[R] \f[B]\[en]extended-register\f[R]
+\f[B]-x\f[R] \f[B]--extended-register\f[R]
 Enables extended register mode.
 See the \f[I]Extended Register Mode\f[R] subsection of the
 \f[B]REGISTERS\f[R] section for more information.
@@ -102,7 +101,7 @@ See the \f[I]Extended Register Mode\f[R] subsection of the
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -111,26 +110,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]DC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -139,6 +148,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other dc(1) implementations, this dc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -230,7 +242,7 @@ guaranteed to \f[B]NOT\f[R] be cryptographically secure.
 This is a consequence of using a seeded pseudo-random number generator.
 However, they \f[I]are\f[R] guaranteed to be reproducible with identical
 \f[B]seed\f[R] values.
-This means that the pseudo-random values from bc(1) should only be used
+This means that the pseudo-random values from dc(1) should only be used
 where a reproducible stream of pseudo-random numbers is
 \f[I]ESSENTIAL\f[R].
 In any other case, use a non-seeded pseudo-random number generator.
@@ -1019,7 +1031,7 @@ Unlike most other dc(1) implentations, this dc(1) provides nearly
 unlimited amounts of registers, if extended register mode is enabled.
 .PP
 If extended register mode is enabled (\f[B]-x\f[R] or
-\f[B]\[en]extended-register\f[R] command-line arguments are given), then
+\f[B]--extended-register\f[R] command-line arguments are given), then
 normal single character registers are used \f[I]unless\f[R] the
 character immediately following a command that needs a register name is
 a space (according to \f[B]isspace()\f[R]) and not a newline
@@ -1159,7 +1171,7 @@ will be correctly parsed, but the string \f[B]\[lq]/home/gavin/some
 The quote parsing will handle either kind of quotes, \f[B]\[cq]\f[R] or
 \f[B]\[lq]\f[R]. Thus, if you have a file with any number of single
 quotes in the name, you can use double quotes as the outside quotes, as
-in \f[B]\[rq]some `bc' file.bc\[dq]\f[R], and vice versa if you have a
+in \f[B]\[rq]some `dc' file.dc\[dq]\f[R], and vice versa if you have a
 file with double quotes.
 However, handling a file with both kinds of quotes in
 \f[B]DC_ENV_ARGS\f[R] is not supported due to the complexity of the
@@ -1242,17 +1254,17 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 dc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, dc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,7 +34,7 @@ dc - arbitrary-precision decimal reverse-Polish notation calculator

 # SYNOPSIS

-**dc** [**-hiPvVx**] [**--version**] [**--help**] [**--interactive**] [**--no-prompt**] [**--extended-register**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...] [*file*...]
+**dc** [**-hiPvVx**] [**-\-version**] [**-\-help**] [**-\-interactive**] [**-\-no-prompt**] [**-\-extended-register**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -43,11 +43,11 @@ notation) to store numbers and results of computations. Arithmetic operations
 pop arguments off of the stack and push the results.

 If no files are given on the command-line as extra arguments (i.e., not as
-**-f** or **--file** arguments), then dc(1) reads from **stdin**. Otherwise,
+**-f** or **-\-file** arguments), then dc(1) reads from **stdin**. Otherwise,
 those files are processed, and dc(1) will then exit.

 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where **-e** (**--expression**) and **-f** (**--file**)
+implementations, where **-e** (**-\-expression**) and **-f** (**-\-file**)
 arguments cause dc(1) to execute them and exit. The reason for this is that this
 dc(1) allows users to set arguments in the environment variable **DC_ENV_ARGS**
 (see the **ENVIRONMENT VARIABLES** section). Any expressions given on the
@@ -64,55 +64,62 @@ as the last command-line argument or define the environment variable

 The following are the options that dc(1) accepts.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   This option is a no-op.

    This is a **non-portable extension**.

-**-x** **--extended-register**
+**-x** **-\-extended-register**

 :   Enables extended register mode. See the *Extended Register Mode* subsection
    of the **REGISTERS** section for more information.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **DC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -120,7 +127,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other dc(1) implementations, this dc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -195,7 +204,7 @@ command or the **"** command that does not get receive a value of **0** or
 **'** and **"** commands are guaranteed to **NOT** be cryptographically secure.
 This is a consequence of using a seeded pseudo-random number generator. However,
 they *are* guaranteed to be reproducible with identical **seed** values. This
-means that the pseudo-random values from bc(1) should only be used where a
+means that the pseudo-random values from dc(1) should only be used where a
 reproducible stream of pseudo-random numbers is *ESSENTIAL*. In any other case,
 use a non-seeded pseudo-random number generator.

@@ -897,7 +906,7 @@ follows any command that needs a register name. The only exception is a newline
 Unlike most other dc(1) implentations, this dc(1) provides nearly unlimited
 amounts of registers, if extended register mode is enabled.

-If extended register mode is enabled (**-x** or **--extended-register**
+If extended register mode is enabled (**-x** or **-\-extended-register**
 command-line arguments are given), then normal single character registers are
 used *unless* the character immediately following a command that needs a
 register name is a space (according to **isspace()**) and not a newline
@@ -1030,7 +1039,7 @@ dc(1) recognizes the following environment variables:

    The quote parsing will handle either kind of quotes, **'** or **"**. Thus,
    if you have a file with any number of single quotes in the name, you can use
-    double quotes as the outside quotes, as in **"some 'bc' file.bc"**, and vice
+    double quotes as the outside quotes, as in **"some 'dc' file.dc"**, and vice
    versa if you have a file with double quotes. However, handling a file with
    both kinds of quotes in **DC_ENV_ARGS** is not supported due to the
    complexity of the parsing, though such files are still supported on the
@@ -1106,17 +1115,17 @@ The other statuses will only be returned when dc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since dc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, dc(1) attempts to recover from errors (see the **RESET**
@@ -25,18 +25,17 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "DC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "DC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH Name
 .PP
 dc - arbitrary-precision decimal reverse-Polish notation calculator
 .SH SYNOPSIS
 .PP
-\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]\[en]version\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]no-prompt\f[R]] [\f[B]\[en]extended-register\f[R]]
-[\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]--version\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--no-prompt\f[R]]
+[\f[B]--extended-register\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -47,13 +46,13 @@ Arithmetic operations pop arguments off of the stack and push the
 results.
 .PP
 If no files are given on the command-line as extra arguments (i.e., not
-as \f[B]-f\f[R] or \f[B]\[en]file\f[R] arguments), then dc(1) reads from
+as \f[B]-f\f[R] or \f[B]--file\f[R] arguments), then dc(1) reads from
 \f[B]stdin\f[R].
 Otherwise, those files are processed, and dc(1) will then exit.
 .PP
 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where \f[B]-e\f[R] (\f[B]\[en]expression\f[R]) and
-\f[B]-f\f[R] (\f[B]\[en]file\f[R]) arguments cause dc(1) to execute them
+implementations, where \f[B]-e\f[R] (\f[B]--expression\f[R]) and
+\f[B]-f\f[R] (\f[B]--file\f[R]) arguments cause dc(1) to execute them
 and exit.
 The reason for this is that this dc(1) allows users to set arguments in
 the environment variable \f[B]DC_ENV_ARGS\f[R] (see the \f[B]ENVIRONMENT
@@ -72,13 +71,13 @@ argument or define the environment variable \f[B]DC_EXPR_EXIT\f[R].
 .PP
 The following are the options that dc(1) accepts.
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -86,14 +85,14 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 This option is a no-op.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-x\f[R] \f[B]\[en]extended-register\f[R]
+\f[B]-x\f[R] \f[B]--extended-register\f[R]
 Enables extended register mode.
 See the \f[I]Extended Register Mode\f[R] subsection of the
 \f[B]REGISTERS\f[R] section for more information.
@@ -102,7 +101,7 @@ See the \f[I]Extended Register Mode\f[R] subsection of the
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -111,26 +110,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]DC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -139,6 +148,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other dc(1) implementations, this dc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -230,7 +242,7 @@ guaranteed to \f[B]NOT\f[R] be cryptographically secure.
 This is a consequence of using a seeded pseudo-random number generator.
 However, they \f[I]are\f[R] guaranteed to be reproducible with identical
 \f[B]seed\f[R] values.
-This means that the pseudo-random values from bc(1) should only be used
+This means that the pseudo-random values from dc(1) should only be used
 where a reproducible stream of pseudo-random numbers is
 \f[I]ESSENTIAL\f[R].
 In any other case, use a non-seeded pseudo-random number generator.
@@ -1019,7 +1031,7 @@ Unlike most other dc(1) implentations, this dc(1) provides nearly
 unlimited amounts of registers, if extended register mode is enabled.
 .PP
 If extended register mode is enabled (\f[B]-x\f[R] or
-\f[B]\[en]extended-register\f[R] command-line arguments are given), then
+\f[B]--extended-register\f[R] command-line arguments are given), then
 normal single character registers are used \f[I]unless\f[R] the
 character immediately following a command that needs a register name is
 a space (according to \f[B]isspace()\f[R]) and not a newline
@@ -1159,7 +1171,7 @@ will be correctly parsed, but the string \f[B]\[lq]/home/gavin/some
 The quote parsing will handle either kind of quotes, \f[B]\[cq]\f[R] or
 \f[B]\[lq]\f[R]. Thus, if you have a file with any number of single
 quotes in the name, you can use double quotes as the outside quotes, as
-in \f[B]\[rq]some `bc' file.bc\[dq]\f[R], and vice versa if you have a
+in \f[B]\[rq]some `dc' file.dc\[dq]\f[R], and vice versa if you have a
 file with double quotes.
 However, handling a file with both kinds of quotes in
 \f[B]DC_ENV_ARGS\f[R] is not supported due to the complexity of the
@@ -1242,17 +1254,17 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 dc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, dc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,7 +34,7 @@ dc - arbitrary-precision decimal reverse-Polish notation calculator

 # SYNOPSIS

-**dc** [**-hiPvVx**] [**--version**] [**--help**] [**--interactive**] [**--no-prompt**] [**--extended-register**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...] [*file*...]
+**dc** [**-hiPvVx**] [**-\-version**] [**-\-help**] [**-\-interactive**] [**-\-no-prompt**] [**-\-extended-register**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -43,11 +43,11 @@ notation) to store numbers and results of computations. Arithmetic operations
 pop arguments off of the stack and push the results.

 If no files are given on the command-line as extra arguments (i.e., not as
-**-f** or **--file** arguments), then dc(1) reads from **stdin**. Otherwise,
+**-f** or **-\-file** arguments), then dc(1) reads from **stdin**. Otherwise,
 those files are processed, and dc(1) will then exit.

 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where **-e** (**--expression**) and **-f** (**--file**)
+implementations, where **-e** (**-\-expression**) and **-f** (**-\-file**)
 arguments cause dc(1) to execute them and exit. The reason for this is that this
 dc(1) allows users to set arguments in the environment variable **DC_ENV_ARGS**
 (see the **ENVIRONMENT VARIABLES** section). Any expressions given on the
@@ -64,55 +64,62 @@ as the last command-line argument or define the environment variable

 The following are the options that dc(1) accepts.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   This option is a no-op.

    This is a **non-portable extension**.

-**-x** **--extended-register**
+**-x** **-\-extended-register**

 :   Enables extended register mode. See the *Extended Register Mode* subsection
    of the **REGISTERS** section for more information.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **DC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -120,7 +127,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other dc(1) implementations, this dc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -195,7 +204,7 @@ command or the **"** command that does not get receive a value of **0** or
 **'** and **"** commands are guaranteed to **NOT** be cryptographically secure.
 This is a consequence of using a seeded pseudo-random number generator. However,
 they *are* guaranteed to be reproducible with identical **seed** values. This
-means that the pseudo-random values from bc(1) should only be used where a
+means that the pseudo-random values from dc(1) should only be used where a
 reproducible stream of pseudo-random numbers is *ESSENTIAL*. In any other case,
 use a non-seeded pseudo-random number generator.

@@ -897,7 +906,7 @@ follows any command that needs a register name. The only exception is a newline
 Unlike most other dc(1) implentations, this dc(1) provides nearly unlimited
 amounts of registers, if extended register mode is enabled.

-If extended register mode is enabled (**-x** or **--extended-register**
+If extended register mode is enabled (**-x** or **-\-extended-register**
 command-line arguments are given), then normal single character registers are
 used *unless* the character immediately following a command that needs a
 register name is a space (according to **isspace()**) and not a newline
@@ -1030,7 +1039,7 @@ dc(1) recognizes the following environment variables:

    The quote parsing will handle either kind of quotes, **'** or **"**. Thus,
    if you have a file with any number of single quotes in the name, you can use
-    double quotes as the outside quotes, as in **"some 'bc' file.bc"**, and vice
+    double quotes as the outside quotes, as in **"some 'dc' file.dc"**, and vice
    versa if you have a file with double quotes. However, handling a file with
    both kinds of quotes in **DC_ENV_ARGS** is not supported due to the
    complexity of the parsing, though such files are still supported on the
@@ -1106,17 +1115,17 @@ The other statuses will only be returned when dc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since dc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, dc(1) attempts to recover from errors (see the **RESET**
@@ -25,18 +25,17 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "DC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "DC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH Name
 .PP
 dc - arbitrary-precision decimal reverse-Polish notation calculator
 .SH SYNOPSIS
 .PP
-\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]\[en]version\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]no-prompt\f[R]] [\f[B]\[en]extended-register\f[R]]
-[\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]--version\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--no-prompt\f[R]]
+[\f[B]--extended-register\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -47,13 +46,13 @@ Arithmetic operations pop arguments off of the stack and push the
 results.
 .PP
 If no files are given on the command-line as extra arguments (i.e., not
-as \f[B]-f\f[R] or \f[B]\[en]file\f[R] arguments), then dc(1) reads from
+as \f[B]-f\f[R] or \f[B]--file\f[R] arguments), then dc(1) reads from
 \f[B]stdin\f[R].
 Otherwise, those files are processed, and dc(1) will then exit.
 .PP
 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where \f[B]-e\f[R] (\f[B]\[en]expression\f[R]) and
-\f[B]-f\f[R] (\f[B]\[en]file\f[R]) arguments cause dc(1) to execute them
+implementations, where \f[B]-e\f[R] (\f[B]--expression\f[R]) and
+\f[B]-f\f[R] (\f[B]--file\f[R]) arguments cause dc(1) to execute them
 and exit.
 The reason for this is that this dc(1) allows users to set arguments in
 the environment variable \f[B]DC_ENV_ARGS\f[R] (see the \f[B]ENVIRONMENT
@@ -72,13 +71,13 @@ argument or define the environment variable \f[B]DC_EXPR_EXIT\f[R].
 .PP
 The following are the options that dc(1) accepts.
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -86,7 +85,7 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 Disables the prompt in TTY mode.
 (The prompt is only enabled in TTY mode.
 See the \f[B]TTY MODE\f[R] section) This is mostly for those users that
@@ -98,7 +97,7 @@ Most of those users would want to put this option in
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-x\f[R] \f[B]\[en]extended-register\f[R]
+\f[B]-x\f[R] \f[B]--extended-register\f[R]
 Enables extended register mode.
 See the \f[I]Extended Register Mode\f[R] subsection of the
 \f[B]REGISTERS\f[R] section for more information.
@@ -107,7 +106,7 @@ See the \f[I]Extended Register Mode\f[R] subsection of the
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -116,26 +115,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]DC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -144,6 +153,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other dc(1) implementations, this dc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -235,7 +247,7 @@ guaranteed to \f[B]NOT\f[R] be cryptographically secure.
 This is a consequence of using a seeded pseudo-random number generator.
 However, they \f[I]are\f[R] guaranteed to be reproducible with identical
 \f[B]seed\f[R] values.
-This means that the pseudo-random values from bc(1) should only be used
+This means that the pseudo-random values from dc(1) should only be used
 where a reproducible stream of pseudo-random numbers is
 \f[I]ESSENTIAL\f[R].
 In any other case, use a non-seeded pseudo-random number generator.
@@ -1024,7 +1036,7 @@ Unlike most other dc(1) implentations, this dc(1) provides nearly
 unlimited amounts of registers, if extended register mode is enabled.
 .PP
 If extended register mode is enabled (\f[B]-x\f[R] or
-\f[B]\[en]extended-register\f[R] command-line arguments are given), then
+\f[B]--extended-register\f[R] command-line arguments are given), then
 normal single character registers are used \f[I]unless\f[R] the
 character immediately following a command that needs a register name is
 a space (according to \f[B]isspace()\f[R]) and not a newline
@@ -1164,7 +1176,7 @@ will be correctly parsed, but the string \f[B]\[lq]/home/gavin/some
 The quote parsing will handle either kind of quotes, \f[B]\[cq]\f[R] or
 \f[B]\[lq]\f[R]. Thus, if you have a file with any number of single
 quotes in the name, you can use double quotes as the outside quotes, as
-in \f[B]\[rq]some `bc' file.bc\[dq]\f[R], and vice versa if you have a
+in \f[B]\[rq]some `dc' file.dc\[dq]\f[R], and vice versa if you have a
 file with double quotes.
 However, handling a file with both kinds of quotes in
 \f[B]DC_ENV_ARGS\f[R] is not supported due to the complexity of the
@@ -1247,17 +1259,17 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 dc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, dc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,7 +34,7 @@ dc - arbitrary-precision decimal reverse-Polish notation calculator

 # SYNOPSIS

-**dc** [**-hiPvVx**] [**--version**] [**--help**] [**--interactive**] [**--no-prompt**] [**--extended-register**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...] [*file*...]
+**dc** [**-hiPvVx**] [**-\-version**] [**-\-help**] [**-\-interactive**] [**-\-no-prompt**] [**-\-extended-register**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -43,11 +43,11 @@ notation) to store numbers and results of computations. Arithmetic operations
 pop arguments off of the stack and push the results.

 If no files are given on the command-line as extra arguments (i.e., not as
-**-f** or **--file** arguments), then dc(1) reads from **stdin**. Otherwise,
+**-f** or **-\-file** arguments), then dc(1) reads from **stdin**. Otherwise,
 those files are processed, and dc(1) will then exit.

 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where **-e** (**--expression**) and **-f** (**--file**)
+implementations, where **-e** (**-\-expression**) and **-f** (**-\-file**)
 arguments cause dc(1) to execute them and exit. The reason for this is that this
 dc(1) allows users to set arguments in the environment variable **DC_ENV_ARGS**
 (see the **ENVIRONMENT VARIABLES** section). Any expressions given on the
@@ -64,21 +64,21 @@ as the last command-line argument or define the environment variable

 The following are the options that dc(1) accepts.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   Disables the prompt in TTY mode. (The prompt is only enabled in TTY mode.
    See the **TTY MODE** section) This is mostly for those users that do not
@@ -87,35 +87,42 @@ The following are the options that dc(1) accepts.

    This is a **non-portable extension**.

-**-x** **--extended-register**
+**-x** **-\-extended-register**

 :   Enables extended register mode. See the *Extended Register Mode* subsection
    of the **REGISTERS** section for more information.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **DC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -123,7 +130,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other dc(1) implementations, this dc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -198,7 +207,7 @@ command or the **"** command that does not get receive a value of **0** or
 **'** and **"** commands are guaranteed to **NOT** be cryptographically secure.
 This is a consequence of using a seeded pseudo-random number generator. However,
 they *are* guaranteed to be reproducible with identical **seed** values. This
-means that the pseudo-random values from bc(1) should only be used where a
+means that the pseudo-random values from dc(1) should only be used where a
 reproducible stream of pseudo-random numbers is *ESSENTIAL*. In any other case,
 use a non-seeded pseudo-random number generator.

@@ -900,7 +909,7 @@ follows any command that needs a register name. The only exception is a newline
 Unlike most other dc(1) implentations, this dc(1) provides nearly unlimited
 amounts of registers, if extended register mode is enabled.

-If extended register mode is enabled (**-x** or **--extended-register**
+If extended register mode is enabled (**-x** or **-\-extended-register**
 command-line arguments are given), then normal single character registers are
 used *unless* the character immediately following a command that needs a
 register name is a space (according to **isspace()**) and not a newline
@@ -1033,7 +1042,7 @@ dc(1) recognizes the following environment variables:

    The quote parsing will handle either kind of quotes, **'** or **"**. Thus,
    if you have a file with any number of single quotes in the name, you can use
-    double quotes as the outside quotes, as in **"some 'bc' file.bc"**, and vice
+    double quotes as the outside quotes, as in **"some 'dc' file.dc"**, and vice
    versa if you have a file with double quotes. However, handling a file with
    both kinds of quotes in **DC_ENV_ARGS** is not supported due to the
    complexity of the parsing, though such files are still supported on the
@@ -1109,17 +1118,17 @@ The other statuses will only be returned when dc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since dc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, dc(1) attempts to recover from errors (see the **RESET**
@@ -25,18 +25,17 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "DC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "DC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH Name
 .PP
 dc - arbitrary-precision decimal reverse-Polish notation calculator
 .SH SYNOPSIS
 .PP
-\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]\[en]version\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]no-prompt\f[R]] [\f[B]\[en]extended-register\f[R]]
-[\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]--version\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--no-prompt\f[R]]
+[\f[B]--extended-register\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -47,13 +46,13 @@ Arithmetic operations pop arguments off of the stack and push the
 results.
 .PP
 If no files are given on the command-line as extra arguments (i.e., not
-as \f[B]-f\f[R] or \f[B]\[en]file\f[R] arguments), then dc(1) reads from
+as \f[B]-f\f[R] or \f[B]--file\f[R] arguments), then dc(1) reads from
 \f[B]stdin\f[R].
 Otherwise, those files are processed, and dc(1) will then exit.
 .PP
 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where \f[B]-e\f[R] (\f[B]\[en]expression\f[R]) and
-\f[B]-f\f[R] (\f[B]\[en]file\f[R]) arguments cause dc(1) to execute them
+implementations, where \f[B]-e\f[R] (\f[B]--expression\f[R]) and
+\f[B]-f\f[R] (\f[B]--file\f[R]) arguments cause dc(1) to execute them
 and exit.
 The reason for this is that this dc(1) allows users to set arguments in
 the environment variable \f[B]DC_ENV_ARGS\f[R] (see the \f[B]ENVIRONMENT
@@ -72,13 +71,13 @@ argument or define the environment variable \f[B]DC_EXPR_EXIT\f[R].
 .PP
 The following are the options that dc(1) accepts.
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -86,14 +85,14 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 This option is a no-op.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-x\f[R] \f[B]\[en]extended-register\f[R]
+\f[B]-x\f[R] \f[B]--extended-register\f[R]
 Enables extended register mode.
 See the \f[I]Extended Register Mode\f[R] subsection of the
 \f[B]REGISTERS\f[R] section for more information.
@@ -102,7 +101,7 @@ See the \f[I]Extended Register Mode\f[R] subsection of the
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -111,26 +110,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]DC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -139,6 +148,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other dc(1) implementations, this dc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -230,7 +242,7 @@ guaranteed to \f[B]NOT\f[R] be cryptographically secure.
 This is a consequence of using a seeded pseudo-random number generator.
 However, they \f[I]are\f[R] guaranteed to be reproducible with identical
 \f[B]seed\f[R] values.
-This means that the pseudo-random values from bc(1) should only be used
+This means that the pseudo-random values from dc(1) should only be used
 where a reproducible stream of pseudo-random numbers is
 \f[I]ESSENTIAL\f[R].
 In any other case, use a non-seeded pseudo-random number generator.
@@ -1019,7 +1031,7 @@ Unlike most other dc(1) implentations, this dc(1) provides nearly
 unlimited amounts of registers, if extended register mode is enabled.
 .PP
 If extended register mode is enabled (\f[B]-x\f[R] or
-\f[B]\[en]extended-register\f[R] command-line arguments are given), then
+\f[B]--extended-register\f[R] command-line arguments are given), then
 normal single character registers are used \f[I]unless\f[R] the
 character immediately following a command that needs a register name is
 a space (according to \f[B]isspace()\f[R]) and not a newline
@@ -1159,7 +1171,7 @@ will be correctly parsed, but the string \f[B]\[lq]/home/gavin/some
 The quote parsing will handle either kind of quotes, \f[B]\[cq]\f[R] or
 \f[B]\[lq]\f[R]. Thus, if you have a file with any number of single
 quotes in the name, you can use double quotes as the outside quotes, as
-in \f[B]\[rq]some `bc' file.bc\[dq]\f[R], and vice versa if you have a
+in \f[B]\[rq]some `dc' file.dc\[dq]\f[R], and vice versa if you have a
 file with double quotes.
 However, handling a file with both kinds of quotes in
 \f[B]DC_ENV_ARGS\f[R] is not supported due to the complexity of the
@@ -1242,17 +1254,17 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 dc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, dc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,7 +34,7 @@ dc - arbitrary-precision decimal reverse-Polish notation calculator

 # SYNOPSIS

-**dc** [**-hiPvVx**] [**--version**] [**--help**] [**--interactive**] [**--no-prompt**] [**--extended-register**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...] [*file*...]
+**dc** [**-hiPvVx**] [**-\-version**] [**-\-help**] [**-\-interactive**] [**-\-no-prompt**] [**-\-extended-register**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -43,11 +43,11 @@ notation) to store numbers and results of computations. Arithmetic operations
 pop arguments off of the stack and push the results.

 If no files are given on the command-line as extra arguments (i.e., not as
-**-f** or **--file** arguments), then dc(1) reads from **stdin**. Otherwise,
+**-f** or **-\-file** arguments), then dc(1) reads from **stdin**. Otherwise,
 those files are processed, and dc(1) will then exit.

 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where **-e** (**--expression**) and **-f** (**--file**)
+implementations, where **-e** (**-\-expression**) and **-f** (**-\-file**)
 arguments cause dc(1) to execute them and exit. The reason for this is that this
 dc(1) allows users to set arguments in the environment variable **DC_ENV_ARGS**
 (see the **ENVIRONMENT VARIABLES** section). Any expressions given on the
@@ -64,55 +64,62 @@ as the last command-line argument or define the environment variable

 The following are the options that dc(1) accepts.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   This option is a no-op.

    This is a **non-portable extension**.

-**-x** **--extended-register**
+**-x** **-\-extended-register**

 :   Enables extended register mode. See the *Extended Register Mode* subsection
    of the **REGISTERS** section for more information.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **DC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -120,7 +127,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other dc(1) implementations, this dc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -195,7 +204,7 @@ command or the **"** command that does not get receive a value of **0** or
 **'** and **"** commands are guaranteed to **NOT** be cryptographically secure.
 This is a consequence of using a seeded pseudo-random number generator. However,
 they *are* guaranteed to be reproducible with identical **seed** values. This
-means that the pseudo-random values from bc(1) should only be used where a
+means that the pseudo-random values from dc(1) should only be used where a
 reproducible stream of pseudo-random numbers is *ESSENTIAL*. In any other case,
 use a non-seeded pseudo-random number generator.

@@ -897,7 +906,7 @@ follows any command that needs a register name. The only exception is a newline
 Unlike most other dc(1) implentations, this dc(1) provides nearly unlimited
 amounts of registers, if extended register mode is enabled.

-If extended register mode is enabled (**-x** or **--extended-register**
+If extended register mode is enabled (**-x** or **-\-extended-register**
 command-line arguments are given), then normal single character registers are
 used *unless* the character immediately following a command that needs a
 register name is a space (according to **isspace()**) and not a newline
@@ -1030,7 +1039,7 @@ dc(1) recognizes the following environment variables:

    The quote parsing will handle either kind of quotes, **'** or **"**. Thus,
    if you have a file with any number of single quotes in the name, you can use
-    double quotes as the outside quotes, as in **"some 'bc' file.bc"**, and vice
+    double quotes as the outside quotes, as in **"some 'dc' file.dc"**, and vice
    versa if you have a file with double quotes. However, handling a file with
    both kinds of quotes in **DC_ENV_ARGS** is not supported due to the
    complexity of the parsing, though such files are still supported on the
@@ -1106,17 +1115,17 @@ The other statuses will only be returned when dc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since dc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, dc(1) attempts to recover from errors (see the **RESET**
@@ -25,18 +25,17 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.TH "DC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "DC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
 .SH Name
 .PP
 dc - arbitrary-precision decimal reverse-Polish notation calculator
 .SH SYNOPSIS
 .PP
-\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]\[en]version\f[R]]
-[\f[B]\[en]help\f[R]] [\f[B]\[en]interactive\f[R]]
-[\f[B]\[en]no-prompt\f[R]] [\f[B]\[en]extended-register\f[R]]
-[\f[B]-e\f[R] \f[I]expr\f[R]]
-[\f[B]\[en]expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
-\f[I]file\f[R]\&...] [\f[B]-file\f[R]=\f[I]file\f[R]\&...]
+\f[B]dc\f[R] [\f[B]-hiPvVx\f[R]] [\f[B]--version\f[R]]
+[\f[B]--help\f[R]] [\f[B]--interactive\f[R]] [\f[B]--no-prompt\f[R]]
+[\f[B]--extended-register\f[R]] [\f[B]-e\f[R] \f[I]expr\f[R]]
+[\f[B]--expression\f[R]=\f[I]expr\f[R]\&...] [\f[B]-f\f[R]
+\f[I]file\f[R]\&...] [\f[B]--file\f[R]=\f[I]file\f[R]\&...]
 [\f[I]file\f[R]\&...]
 .SH DESCRIPTION
 .PP
@@ -47,13 +46,13 @@ Arithmetic operations pop arguments off of the stack and push the
 results.
 .PP
 If no files are given on the command-line as extra arguments (i.e., not
-as \f[B]-f\f[R] or \f[B]\[en]file\f[R] arguments), then dc(1) reads from
+as \f[B]-f\f[R] or \f[B]--file\f[R] arguments), then dc(1) reads from
 \f[B]stdin\f[R].
 Otherwise, those files are processed, and dc(1) will then exit.
 .PP
 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where \f[B]-e\f[R] (\f[B]\[en]expression\f[R]) and
-\f[B]-f\f[R] (\f[B]\[en]file\f[R]) arguments cause dc(1) to execute them
+implementations, where \f[B]-e\f[R] (\f[B]--expression\f[R]) and
+\f[B]-f\f[R] (\f[B]--file\f[R]) arguments cause dc(1) to execute them
 and exit.
 The reason for this is that this dc(1) allows users to set arguments in
 the environment variable \f[B]DC_ENV_ARGS\f[R] (see the \f[B]ENVIRONMENT
@@ -72,13 +71,13 @@ argument or define the environment variable \f[B]DC_EXPR_EXIT\f[R].
 .PP
 The following are the options that dc(1) accepts.
 .TP
-\f[B]-h\f[R], \f[B]\[en]help\f[R]
+\f[B]-h\f[R], \f[B]--help\f[R]
 Prints a usage message and quits.
 .TP
-\f[B]-v\f[R], \f[B]-V\f[R], \f[B]\[en]version\f[R]
+\f[B]-v\f[R], \f[B]-V\f[R], \f[B]--version\f[R]
 Print the version information (copyright header) and exit.
 .TP
-\f[B]-i\f[R], \f[B]\[en]interactive\f[R]
+\f[B]-i\f[R], \f[B]--interactive\f[R]
 Forces interactive mode.
 (See the \f[B]INTERACTIVE MODE\f[R] section.)
 .RS
@@ -86,14 +85,14 @@ Forces interactive mode.
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-P\f[R], \f[B]\[en]no-prompt\f[R]
+\f[B]-P\f[R], \f[B]--no-prompt\f[R]
 This option is a no-op.
 .RS
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-x\f[R] \f[B]\[en]extended-register\f[R]
+\f[B]-x\f[R] \f[B]--extended-register\f[R]
 Enables extended register mode.
 See the \f[I]Extended Register Mode\f[R] subsection of the
 \f[B]REGISTERS\f[R] section for more information.
@@ -102,7 +101,7 @@ See the \f[I]Extended Register Mode\f[R] subsection of the
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-e\f[R] \f[I]expr\f[R], \f[B]\[en]expression\f[R]=\f[I]expr\f[R]
+\f[B]-e\f[R] \f[I]expr\f[R], \f[B]--expression\f[R]=\f[I]expr\f[R]
 Evaluates \f[I]expr\f[R].
 If multiple expressions are given, they are evaluated in order.
 If files are given as well (see below), the expressions and files are
@@ -111,26 +110,36 @@ This means that if a file is given before an expression, the file is
 read in and evaluated first.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
+\f[B]-f\f[R] or \f[B]--file\f[R], whether on the command-line or in
+\f[B]DC_ENV_ARGS\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
 .TP
-\f[B]-f\f[R] \f[I]file\f[R], \f[B]\[en]file\f[R]=\f[I]file\f[R]
+\f[B]-f\f[R] \f[I]file\f[R], \f[B]--file\f[R]=\f[I]file\f[R]
 Reads in \f[I]file\f[R] and evaluates it, line by line, as though it
 were read through \f[B]stdin\f[R].
 If expressions are also given (see above), the expressions are evaluated
 in the order given.
 .RS
 .PP
-After processing all expressions and files, dc(1) will exit, unless
+If this option is given on the command-line (i.e., not in
+\f[B]DC_ENV_ARGS\f[R], see the \f[B]ENVIRONMENT VARIABLES\f[R] section),
+then after processing all expressions and files, dc(1) will exit, unless
 \f[B]-\f[R] (\f[B]stdin\f[R]) was given as an argument at least once to
-\f[B]-f\f[R] or \f[B]\[en]file\f[R].
-However, if any other \f[B]-e\f[R], \f[B]\[en]expression\f[R],
-\f[B]-f\f[R], or \f[B]\[en]file\f[R] arguments are given after that,
-bc(1) will give a fatal error and exit.
+\f[B]-f\f[R] or \f[B]--file\f[R].
+However, if any other \f[B]-e\f[R], \f[B]--expression\f[R],
+\f[B]-f\f[R], or \f[B]--file\f[R] arguments are given after
+\f[B]-f-\f[R] or equivalent is given, dc(1) will give a fatal error and
+exit.
 .PP
 This is a \f[B]non-portable extension\f[R].
 .RE
@@ -139,6 +148,9 @@ All long options are \f[B]non-portable extensions\f[R].
 .SH STDOUT
 .PP
 Any non-error output is written to \f[B]stdout\f[R].
+In addition, if history (see the \f[B]HISTORY\f[R] section) and the
+prompt (see the \f[B]TTY MODE\f[R] section) are enabled, both are output
+to \f[B]stdout\f[R].
 .PP
 \f[B]Note\f[R]: Unlike other dc(1) implementations, this dc(1) will
 issue a fatal error (see the \f[B]EXIT STATUS\f[R] section) if it cannot
@@ -230,7 +242,7 @@ guaranteed to \f[B]NOT\f[R] be cryptographically secure.
 This is a consequence of using a seeded pseudo-random number generator.
 However, they \f[I]are\f[R] guaranteed to be reproducible with identical
 \f[B]seed\f[R] values.
-This means that the pseudo-random values from bc(1) should only be used
+This means that the pseudo-random values from dc(1) should only be used
 where a reproducible stream of pseudo-random numbers is
 \f[I]ESSENTIAL\f[R].
 In any other case, use a non-seeded pseudo-random number generator.
@@ -1019,7 +1031,7 @@ Unlike most other dc(1) implentations, this dc(1) provides nearly
 unlimited amounts of registers, if extended register mode is enabled.
 .PP
 If extended register mode is enabled (\f[B]-x\f[R] or
-\f[B]\[en]extended-register\f[R] command-line arguments are given), then
+\f[B]--extended-register\f[R] command-line arguments are given), then
 normal single character registers are used \f[I]unless\f[R] the
 character immediately following a command that needs a register name is
 a space (according to \f[B]isspace()\f[R]) and not a newline
@@ -1159,7 +1171,7 @@ will be correctly parsed, but the string \f[B]\[lq]/home/gavin/some
 The quote parsing will handle either kind of quotes, \f[B]\[cq]\f[R] or
 \f[B]\[lq]\f[R]. Thus, if you have a file with any number of single
 quotes in the name, you can use double quotes as the outside quotes, as
-in \f[B]\[rq]some `bc' file.bc\[dq]\f[R], and vice versa if you have a
+in \f[B]\[rq]some `dc' file.dc\[dq]\f[R], and vice versa if you have a
 file with double quotes.
 However, handling a file with both kinds of quotes in
 \f[B]DC_ENV_ARGS\f[R] is not supported due to the complexity of the
@@ -1242,17 +1254,17 @@ interactive mode (see the \f[B]INTERACTIVE MODE\f[R] section), since
 dc(1) resets its state (see the \f[B]RESET\f[R] section) and accepts
 more input when one of those errors occurs in interactive mode.
 This is also the case when interactive mode is forced by the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .PP
 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the
-\f[B]-i\f[R] flag or \f[B]\[en]interactive\f[R] option.
+\f[B]-i\f[R] flag or \f[B]--interactive\f[R] option.
 .SH INTERACTIVE MODE
 .PP
 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both \f[B]stdin\f[R]
 and \f[B]stdout\f[R] are hooked to a terminal, but the \f[B]-i\f[R] flag
-and \f[B]\[en]interactive\f[R] option can turn it on in other cases.
+and \f[B]--interactive\f[R] option can turn it on in other cases.
 .PP
 In interactive mode, dc(1) attempts to recover from errors (see the
 \f[B]RESET\f[R] section), and in normal execution, flushes
@@ -34,7 +34,7 @@ dc - arbitrary-precision decimal reverse-Polish notation calculator

 # SYNOPSIS

-**dc** [**-hiPvVx**] [**--version**] [**--help**] [**--interactive**] [**--no-prompt**] [**--extended-register**] [**-e** *expr*] [**--expression**=*expr*...] [**-f** *file*...] [**-file**=*file*...] [*file*...]
+**dc** [**-hiPvVx**] [**-\-version**] [**-\-help**] [**-\-interactive**] [**-\-no-prompt**] [**-\-extended-register**] [**-e** *expr*] [**-\-expression**=*expr*...] [**-f** *file*...] [**-\-file**=*file*...] [*file*...]

 # DESCRIPTION

@@ -43,11 +43,11 @@ notation) to store numbers and results of computations. Arithmetic operations
 pop arguments off of the stack and push the results.

 If no files are given on the command-line as extra arguments (i.e., not as
-**-f** or **--file** arguments), then dc(1) reads from **stdin**. Otherwise,
+**-f** or **-\-file** arguments), then dc(1) reads from **stdin**. Otherwise,
 those files are processed, and dc(1) will then exit.

 This is different from the dc(1) on OpenBSD and possibly other dc(1)
-implementations, where **-e** (**--expression**) and **-f** (**--file**)
+implementations, where **-e** (**-\-expression**) and **-f** (**-\-file**)
 arguments cause dc(1) to execute them and exit. The reason for this is that this
 dc(1) allows users to set arguments in the environment variable **DC_ENV_ARGS**
 (see the **ENVIRONMENT VARIABLES** section). Any expressions given on the
@@ -64,55 +64,62 @@ as the last command-line argument or define the environment variable

 The following are the options that dc(1) accepts.

-**-h**, **--help**
+**-h**, **-\-help**

 :   Prints a usage message and quits.

-**-v**, **-V**, **--version**
+**-v**, **-V**, **-\-version**

 :   Print the version information (copyright header) and exit.

-**-i**, **--interactive**
+**-i**, **-\-interactive**

 :   Forces interactive mode. (See the **INTERACTIVE MODE** section.)

    This is a **non-portable extension**.

-**-P**, **--no-prompt**
+**-P**, **-\-no-prompt**

 :   This option is a no-op.

    This is a **non-portable extension**.

-**-x** **--extended-register**
+**-x** **-\-extended-register**

 :   Enables extended register mode. See the *Extended Register Mode* subsection
    of the **REGISTERS** section for more information.

    This is a **non-portable extension**.

-**-e** *expr*, **--expression**=*expr*
+**-e** *expr*, **-\-expression**=*expr*

 :   Evaluates *expr*. If multiple expressions are given, they are evaluated in
    order. If files are given as well (see below), the expressions and files are
    evaluated in the order given. This means that if a file is given before an
    expression, the file is read in and evaluated first.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**, whether on the
+    command-line or in **DC_ENV_ARGS**. However, if any other **-e**,
+    **-\-expression**, **-f**, or **-\-file** arguments are given after **-f-**
+    or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

-**-f** *file*, **--file**=*file*
+**-f** *file*, **-\-file**=*file*

 :   Reads in *file* and evaluates it, line by line, as though it were read
    through **stdin**. If expressions are also given (see above), the
    expressions are evaluated in the order given.

-    After processing all expressions and files, dc(1) will exit, unless **-**
-    (**stdin**) was given as an argument at least once to **-f** or **--file**.
-    However, if any other **-e**, **--expression**, **-f**, or **--file**
-    arguments are given after that, bc(1) will give a fatal error and exit.
+    If this option is given on the command-line (i.e., not in **DC_ENV_ARGS**,
+    see the **ENVIRONMENT VARIABLES** section), then after processing all
+    expressions and files, dc(1) will exit, unless **-** (**stdin**) was given
+    as an argument at least once to **-f** or **-\-file**. However, if any other
+    **-e**, **-\-expression**, **-f**, or **-\-file** arguments are given after
+    **-f-** or equivalent is given, dc(1) will give a fatal error and exit.

    This is a **non-portable extension**.

@@ -120,7 +127,9 @@ All long options are **non-portable extensions**.

 # STDOUT

-Any non-error output is written to **stdout**.
+Any non-error output is written to **stdout**. In addition, if history (see the
+**HISTORY** section) and the prompt (see the **TTY MODE** section) are enabled,
+both are output to **stdout**.

 **Note**: Unlike other dc(1) implementations, this dc(1) will issue a fatal
 error (see the **EXIT STATUS** section) if it cannot write to **stdout**, so if
@@ -195,7 +204,7 @@ command or the **"** command that does not get receive a value of **0** or
 **'** and **"** commands are guaranteed to **NOT** be cryptographically secure.
 This is a consequence of using a seeded pseudo-random number generator. However,
 they *are* guaranteed to be reproducible with identical **seed** values. This
-means that the pseudo-random values from bc(1) should only be used where a
+means that the pseudo-random values from dc(1) should only be used where a
 reproducible stream of pseudo-random numbers is *ESSENTIAL*. In any other case,
 use a non-seeded pseudo-random number generator.

@@ -897,7 +906,7 @@ follows any command that needs a register name. The only exception is a newline
 Unlike most other dc(1) implentations, this dc(1) provides nearly unlimited
 amounts of registers, if extended register mode is enabled.

-If extended register mode is enabled (**-x** or **--extended-register**
+If extended register mode is enabled (**-x** or **-\-extended-register**
 command-line arguments are given), then normal single character registers are
 used *unless* the character immediately following a command that needs a
 register name is a space (according to **isspace()**) and not a newline
@@ -1030,7 +1039,7 @@ dc(1) recognizes the following environment variables:

    The quote parsing will handle either kind of quotes, **'** or **"**. Thus,
    if you have a file with any number of single quotes in the name, you can use
-    double quotes as the outside quotes, as in **"some 'bc' file.bc"**, and vice
+    double quotes as the outside quotes, as in **"some 'dc' file.dc"**, and vice
    versa if you have a file with double quotes. However, handling a file with
    both kinds of quotes in **DC_ENV_ARGS** is not supported due to the
    complexity of the parsing, though such files are still supported on the
@@ -1106,17 +1115,17 @@ The other statuses will only be returned when dc(1) is not in interactive mode
 (see the **INTERACTIVE MODE** section), since dc(1) resets its state (see the
 **RESET** section) and accepts more input when one of those errors occurs in
 interactive mode. This is also the case when interactive mode is forced by the
-**-i** flag or **--interactive** option.
+**-i** flag or **-\-interactive** option.

 These exit statuses allow dc(1) to be used in shell scripting with error
 checking, and its normal behavior can be forced by using the **-i** flag or
-**--interactive** option.
+**-\-interactive** option.

 # INTERACTIVE MODE

 Like bc(1), dc(1) has an interactive mode and a non-interactive mode.
 Interactive mode is turned on automatically when both **stdin** and **stdout**
-are hooked to a terminal, but the **-i** flag and **--interactive** option can
+are hooked to a terminal, but the **-i** flag and **-\-interactive** option can
 turn it on in other cases.

 In interactive mode, dc(1) attempts to recover from errors (see the **RESET**
@@ -1 +1 @@
-.TH "BC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "BC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
@@ -1 +1 @@
-.TH "BCL" "3" "January 2021" "Gavin D. Howard" "Libraries Manual"
+.TH "BCL" "3" "March 2021" "Gavin D. Howard" "Libraries Manual"
@@ -1 +1 @@
-.TH "DC" "1" "January 2021" "Gavin D. Howard" "General Commands Manual"
+.TH "DC" "1" "March 2021" "Gavin D. Howard" "General Commands Manual"
@@ -575,7 +575,7 @@ if [ "$run_tests" -ne 0 ]; then
 		printf '\n'
 		printf '    <github_release> %s release.sh RELEASE.md\\\n' "$version"
 		printf '    tests/afl.py tests/radamsa.sh tests/radamsa.txt tests/randmath.py \\\n'
-		printf '    tests/bc/scripts/timeconst.bc\n'
+		printf '    tests/fuzzing/ tests/bc/scripts/timeconst.bc\n'

 	fi

@@ -89,7 +89,7 @@ static void bc_args_file(const char *file) {
 	free(buf);
 }

-void bc_args(int argc, char *argv[]) {
+void bc_args(int argc, char *argv[], bool exit_exprs) {

 	int c;
 	size_t i;
@@ -109,6 +109,7 @@ void bc_args(int argc, char *argv[]) {
 				if (vm.no_exit_exprs)
 					bc_vm_verr(BC_ERR_FATAL_OPTION, "-e (--expression)");
 				bc_args_exprs(opts.optarg);
+				vm.exit_exprs = (exit_exprs || vm.exit_exprs);
 				break;
 			}

@@ -119,6 +120,7 @@ void bc_args(int argc, char *argv[]) {
 					if (vm.no_exit_exprs)
 						bc_vm_verr(BC_ERR_FATAL_OPTION, "-f (--file)");
 					bc_args_file(opts.optarg);
+					vm.exit_exprs = (exit_exprs || vm.exit_exprs);
 				}
 				break;
 			}
@@ -2138,7 +2138,7 @@ size_t bc_num_len(const BcNum *restrict n) {

 	size_t len = n->len;

-	if (BC_NUM_ZERO(n)) return 0;
+	if (BC_NUM_ZERO(n)) return n->scale ? n->scale : 1;

 	if (BC_NUM_RDX_VAL(n) == len) {

@@ -1440,6 +1440,8 @@ static void bc_program_printStream(BcProgram *p) {
 		size_t idx = (r->t == BC_RESULT_STR) ? r->d.loc.loc : n->scale;
 		bc_program_printChars(*((char**) bc_vec_item(p->strs, idx)));
 	}
+
+	bc_vec_pop(&p->results);
 }

 static void bc_program_nquit(BcProgram *p, uchar inst) {
@@ -315,7 +315,7 @@ static void bc_vm_envArgs(const char* const env_args_name) {
 	buf = NULL;
 	bc_vec_push(&vm.env_args, &buf);

-	bc_args((int) vm.env_args.len - 1, bc_vec_item(&vm.env_args, 0));
+	bc_args((int) vm.env_args.len - 1, bc_vec_item(&vm.env_args, 0), false);
 }

 static size_t bc_vm_envLen(const char *var) {
@@ -820,7 +820,7 @@ static void bc_vm_exec(void) {

 		BC_SIG_UNLOCK;

-		if (!vm.no_exit_exprs) return;
+		if (!vm.no_exit_exprs && vm.exit_exprs) return;
 	}

 	for (i = 0; i < vm.files.len; ++i) {
@@ -905,7 +905,7 @@ void bc_vm_boot(int argc, char *argv[], const char *env_len,
 #endif // BC_ENABLED

 	bc_vm_envArgs(env_args);
-	bc_args(argc, argv);
+	bc_args(argc, argv, true);

 #if BC_ENABLED
 	if (BC_IS_POSIX) vm.flags &= ~(BC_FLAG_G);
@@ -1,4 +1,7 @@
 length(0)
+length(0.0000)
+length(0.00000000)
+length(0.00000000000)
 length(1)
 length(12)
 length(123)
@@ -1,4 +1,7 @@
-0
+1
+4
+8
+11
 1
 2
 3
@@ -84,6 +84,12 @@ cbrt(27)
 cbrt(-27)
 cbrt(4096)
 cbrt(-4096)
+root(0, 3)
+root(0, 4)
+root(0, 5)
+root(0.0000000000000, 3)
+root(0.0000000000000, 4)
+root(0.0000000000000, 5)
 root(16, 4)
 root(3125, 5)
 root(-3125, 5)
@@ -84,6 +84,12 @@
 -3.00000000000000000000
 16.00000000000000000000
 -16.00000000000000000000
+0
+0
+0
+0
+0
+0
 2.00000000000000000000
 5.00000000000000000000
 -5.00000000000000000000
@@ -15,8 +15,9 @@ t[11] = -1.74
 t[12] = -2
 t[13] = -3.2345
 t[14] = -100
+t[15] = 0.0000000000000000

-l = 15
+l = 16

 a[0] = t[0]

@@ -30,7 +31,11 @@ l -= 1

 for (i = 0; i < l; ++i) {
 	for (j = 0; j < l; ++j) {
-		print "j(", a[i], ", ", a[j], ")\n"
+		print "j(", a[i]
+		if (a[i] == 0 && scale(a[i]) > 0) print ".0000000000000000"
+		print ", ", a[j]
+		if (a[j] == 0 && scale(a[j]) > 0) print ".0000000000000000"
+		print ")\n"
 	}
 }