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
1915 changed files with 30864 additions and 58989 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
@@ -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
@@ -2898,7 +2899,7 @@ _prebuild_libs=	${_kerberos5_lib_libasn1} \
 		lib/libzstd \
 		${_lib_casper} \
 		lib/ncurses/ncurses \
-		lib/libopie lib/libpam/libpam ${_lib_libthr} \
+		lib/libopie lib/libpam/libpam lib/libthr \
 		${_lib_libradius} lib/libsbuf lib/libtacplus \
 		lib/libgeom \
 		${_cddl_lib_libumem} ${_cddl_lib_libnvpair} \
@@ -2932,10 +2933,6 @@ _prebuild_libs+= lib/libc++
 lib/libgeom__L: lib/libexpat__L lib/libsbuf__L
 lib/libkvm__L: lib/libelf__L

-.if ${MK_LIBTHR} != "no"
-_lib_libthr=	lib/libthr
-.endif
-
 .if ${MK_RADIUS_SUPPORT} != "no"
 _lib_libradius=	lib/libradius
 .endif
@@ -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
@@ -10,6 +10,10 @@ newline.  Entries should be separated by a newline.

 Changes to this file should not be MFCed.

+f76393a6305b6:
+	Add AES-GCM support to armv8crypto(4) providing accelerated
+	support for KTLS, IPsec, and other crypto API consumers.
+
 074a91f746bd:
 	The aesni(4) and armv8crypto(4) devices are now included in
 	GENERIC on amd64, i386, and arm64.
@@ -1,4 +1,4 @@
- Updating Information for FreeBSD current users.
+ Updating Information for FreeBSD stable/13 users.

 This file is maintained and copyrighted by M. Warner Losh <[email protected]>.
 See end of file for further details.  For commonly done items, please see the
@@ -11,20 +11,219 @@ handbook:
 Items affecting the ports and packages system can be found in
 /usr/ports/UPDATING.  Please read that file before running portupgrade.

-NOTE TO PEOPLE WHO THINK THAT FreeBSD 13.x IS SLOW:
-	FreeBSD 13.x has many debugging features turned on, in both the kernel
-	and userland.  These features attempt to detect incorrect use of
-	system primitives, and encourage loud failure through extra sanity
-	checking and fail stop semantics.  They also substantially impact
-	system performance.  If you want to do performance measurement,
-	benchmarking, and optimization, you'll want to turn them off.  This
-	includes various WITNESS- related kernel options, INVARIANTS, malloc
-	debugging flags in userland, and various verbose features in the
-	kernel.  Many developers choose to disable these features on build
-	machines to maximize performance.  (To completely disable malloc
-	debugging, define WITH_MALLOC_PRODUCTION in /etc/src.conf and rebuild
-	world, or to merely disable the most expensive debugging functionality
-	at runtime, run "ln -s 'abort:false,junk:false' /etc/malloc.conf".)
+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
+	update.
+
+20210122:
+	The stable/13 branch has been created from main.

 20210108:
 	PC Card attachments for all devices have been removed. In the case of
@@ -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 */
@@ -28,11 +28,9 @@ _libicp_rescue=	libicp_rescue
 _libzfs=	libzfs
 _libzutil=	libzutil
 _libzfsbootenv=	libzfsbootenv
-.if ${MK_LIBTHR} != "no"
 _libzpool=	libzpool
 _libtpool=	libtpool
 .endif
-.endif

 SUBDIR_DEPEND_libctf=		libspl
 SUBDIR_DEPEND_libdtrace=	libctf
@@ -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 \
@@ -15,12 +15,10 @@ SUBDIR.${MK_TESTS}+= tests

 .if ${MK_ZFS} != "no"
 _zinject= zinject
-.if ${MK_LIBTHR} != "no"
 _ztest=	ztest
 _zstream = zstream
 _zstreamdump = zstreamdump
 .endif
-.endif

 SUBDIR_PARALLEL=

@@ -13,10 +13,8 @@ SUBDIR=	${_dtrace} \
 SUBDIR.${MK_TESTS}+= tests

 .if ${MK_ZFS} != "no"
-.if ${MK_LIBTHR} != "no"
 _zdb=	zdb
 _zhack=	zhack
-.endif
 . if ${MK_CXX} != "no"
 _zfsd=	zfsd
 . endif
@@ -34,6 +34,13 @@ config.mak
 timeconst.bc
 Makefile

+tests/fuzzing/bc_outputs1/*
+tests/fuzzing/bc_outputs2/*
+tests/fuzzing/bc_outputs3/*
+tests/fuzzing/dc_outputs/*
+tests/bc_outputs/*
+tests/dc_outputs/*
+
 .gdb_history

 # Ignore the generated test files
@@ -57,5 +64,7 @@ perf.data.old
 *.html
 *.profraw

+core.*
+
 cscope*.out
 tags
@@ -1,6 +1,6 @@
 # License

-Copyright (c) 2018-2020 Gavin D. Howard <yzena.tech@gmail.com>
+Copyright (c) 2018-2021 Gavin D. Howard <yzena.tech@gmail.com>

 Redistribution and use in source and binary forms, with or without modification,
 are permitted provided that the following conditions are met:
@@ -31,7 +31,7 @@ copyrights and license:
 Copyright (c) 2010-2014, Salvatore Sanfilippo <antirez at gmail dot com><br>
 Copyright (c) 2010-2013, Pieter Noordhuis <pcnoordhuis at gmail dot com><br>
 Copyright (c) 2018 rain-1 <rain1@openmailbox.org><br>
-Copyright (c) 2018-2020, Gavin D. Howard <yzena.tech@gmail.com>
+Copyright (c) 2018-2021, Gavin D. Howard <yzena.tech@gmail.com>

 Redistribution and use in source and binary forms, with or without modification,
 are permitted provided that the following conditions are met:
@@ -53,3 +53,51 @@ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+## Rand
+
+The files `src/rand.c` and `include/rand.h` are under the following copyrights
+and license:
+
+Copyright (c) 2014-2017 Melissa O'Neill and PCG Project contributors
+Copyright (c) 2018-2021 Gavin D. Howard <yzena.tech@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+## `safe-install.sh`
+
+The file `safe-install.sh` is under the following copyright and license:
+
+Copyright (c) 2021 Rich Felker
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the “Software”), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
@@ -1,7 +1,7 @@
 #
 # SPDX-License-Identifier: BSD-2-Clause
 #
-# Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+# Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
@@ -29,7 +29,7 @@
 #
 .POSIX:

-VERSION = 3.2.4
+VERSION = 3.3.3

 SRC = %%SRC%%
 OBJ = %%OBJ%%
@@ -41,6 +41,13 @@ BC_ENABLED = %%BC_ENABLED%%
 DC_ENABLED_NAME = DC_ENABLED
 DC_ENABLED = %%DC_ENABLED%%

+HEADERS = include/args.h include/file.h include/lang.h include/lex.h include/num.h include/opt.h include/parse.h include/program.h include/read.h include/status.h include/vector.h include/vm.h
+BC_HEADERS = include/bc.h
+DC_HEADERS = include/dc.h
+HISTORY_HEADERS = include/history.h
+EXTRA_MATH_HEADERS = include/rand.h
+LIBRARY_HEADERS = include/bcl.h include/library.h
+
 GEN_DIR = gen
 GEN = %%GEN%%
 GEN_EXEC = $(GEN_DIR)/$(GEN)
@@ -82,6 +89,11 @@ DC = dc
 BC_EXEC = $(BIN)/$(EXEC_PREFIX)$(BC)
 DC_EXEC = $(BIN)/$(EXEC_PREFIX)$(DC)

+BC_TEST_OUTPUTS = tests/bc_outputs
+BC_FUZZ_OUTPUTS = tests/fuzzing/bc_outputs1 tests/fuzzing/bc_outputs2 tests/fuzzing/bc_outputs3
+DC_TEST_OUTPUTS = tests/dc_outputs
+DC_FUZZ_OUTPUTS = tests/fuzzing/dc_outputs
+
 LIB = libbcl
 LIB_NAME = $(LIB).a
 LIBBC = $(BIN)/$(LIB_NAME)
@@ -125,6 +137,9 @@ BC_ENABLE_NLS = %%NLS%%
 BC_ENABLE_PROMPT = %%PROMPT%%
 BC_LONG_BIT = %%LONG_BIT%%

+BC_ENABLE_AFL = %%FUZZ%%
+BC_ENABLE_MEMCHECK = %%MEMCHECK%%
+
 RM = rm
 MKDIR = mkdir

@@ -138,6 +153,8 @@ LOCALE_UNINSTALL = ./locale_uninstall.sh

 VALGRIND_ARGS = --error-exitcode=100 --leak-check=full --show-leak-kinds=all --errors-for-leak-kinds=all

+TEST_STARS = "***********************************************************************"
+
 BC_NUM_KARATSUBA_LEN = %%KARATSUBA_LEN%%

 CPPFLAGS1 = -D$(BC_ENABLED_NAME)=$(BC_ENABLED) -D$(DC_ENABLED_NAME)=$(DC_ENABLED)
@@ -147,7 +164,8 @@ CPPFLAGS4 = $(CPPFLAGS3) -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700
 CPPFLAGS5 = $(CPPFLAGS4) -DBC_NUM_KARATSUBA_LEN=$(BC_NUM_KARATSUBA_LEN)
 CPPFLAGS6 = $(CPPFLAGS5) -DBC_ENABLE_NLS=$(BC_ENABLE_NLS) -DBC_ENABLE_PROMPT=$(BC_ENABLE_PROMPT)
 CPPFLAGS7 = $(CPPFLAGS6) -D$(BC_ENABLE_EXTRA_MATH_NAME)=$(BC_ENABLE_EXTRA_MATH)
-CPPFLAGS = $(CPPFLAGS7) -DBC_ENABLE_HISTORY=$(BC_ENABLE_HISTORY) -DBC_ENABLE_LIBRARY=$(BC_ENABLE_LIBRARY)
+CPPFLAGS8 = $(CPPFLAGS7) -DBC_ENABLE_HISTORY=$(BC_ENABLE_HISTORY) -DBC_ENABLE_LIBRARY=$(BC_ENABLE_LIBRARY)
+CPPFLAGS = $(CPPFLAGS8) -DBC_ENABLE_MEMCHECK=$(BC_ENABLE_MEMCHECK) -DBC_ENABLE_AFL=$(BC_ENABLE_AFL)
 CFLAGS = $(CPPFLAGS) %%CPPFLAGS%% %%CFLAGS%%
 LDFLAGS = %%LDFLAGS%%

@@ -159,20 +177,15 @@ HOSTCC = %%HOSTCC%%
 BC_LIB_C_ARGS = bc_lib bc_lib_name $(BC_ENABLED_NAME) 1
 BC_LIB2_C_ARGS = bc_lib2 bc_lib2_name "$(BC_ENABLED_NAME) && $(BC_ENABLE_EXTRA_MATH_NAME)" 1

-OBJS = $(BC_HELP_O) $(DC_HELP_O) $(BC_LIB_O) $(BC_LIB2_O) $(OBJ)
-OBJ_TARGETS = $(DC_HELP_O) $(BC_HELP_O) $(BC_LIB_O) $(BC_LIB2_O) $(OBJ)
+OBJS = $(DC_HELP_O) $(BC_HELP_O) $(BC_LIB_O) $(BC_LIB2_O) $(OBJ)

-.c.o:
-	$(CC) $(CFLAGS) -o $@ -c $<
+all: %%DEFAULT_TARGET%%

-all: %%ALL_PREREQ%%
+%%DEFAULT_TARGET%%: %%DEFAULT_TARGET_PREREQS%%
+	%%DEFAULT_TARGET_CMD%%

-execs: make_bin $(OBJ_TARGETS)
-	$(CC) $(CFLAGS) $(OBJS) $(LDFLAGS) -o $(EXEC)
-	%%LINK%%
-
-library: make_bin $(OBJ) $(BC_LIB_O) $(BC_LIB2_O)
-	ar -r -cu $(LIBBC) $(BC_LIB_O) $(BC_LIB2_O) $(OBJ)
+%%SECOND_TARGET%%: %%SECOND_TARGET_PREREQS%%
+	%%SECOND_TARGET_CMD%%

 $(GEN_EXEC):
 	%%GEN_EXEC_TARGET%%
@@ -180,18 +193,32 @@ $(GEN_EXEC):
 $(BC_LIB_C): $(GEN_EXEC) $(BC_LIB)
 	$(GEN_EMU) $(GEN_EXEC) $(BC_LIB) $(BC_LIB_C) $(BC_LIB_C_ARGS)

+$(BC_LIB_O): $(BC_LIB_C)
+	$(CC) $(CFLAGS) -o $@ -c $<
+
 $(BC_LIB2_C): $(GEN_EXEC) $(BC_LIB2)
 	$(GEN_EMU) $(GEN_EXEC) $(BC_LIB2) $(BC_LIB2_C) $(BC_LIB2_C_ARGS)

+$(BC_LIB2_O): $(BC_LIB2_C)
+	$(CC) $(CFLAGS) -o $@ -c $<
+
 $(BC_HELP_C): $(GEN_EXEC) $(BC_HELP)
 	$(GEN_EMU) $(GEN_EXEC) $(BC_HELP) $(BC_HELP_C) bc_help "" $(BC_ENABLED_NAME)

+$(BC_HELP_O): $(BC_HELP_C)
+	$(CC) $(CFLAGS) -o $@ -c $<
+
 $(DC_HELP_C): $(GEN_EXEC) $(DC_HELP)
 	$(GEN_EMU) $(GEN_EXEC) $(DC_HELP) $(DC_HELP_C) dc_help "" $(DC_ENABLED_NAME)

-make_bin:
+$(DC_HELP_O): $(DC_HELP_C)
+	$(CC) $(CFLAGS) -o $@ -c $<
+
+$(BIN):
 	$(MKDIR) -p $(BIN)

+headers: %%HEADERS%%
+
 help:
 	@printf 'available targets:\n'
 	@printf '\n'
@@ -222,41 +249,68 @@ help:
 	@printf '    valgrind_dc     runs the dc test suite, if dc has been built,\n'
 	@printf '                    through valgrind\n'

+run_all_tests:
+	%%BC_ALL_TESTS%%
+	%%TIMECONST_ALL_TESTS%%
+	%%DC_ALL_TESTS%%
+
 check: test

 test: %%TESTS%%

-test_bc:
-	%%BC_TEST%%
+test_bc: test_bc_header test_bc_tests test_bc_scripts test_bc_stdin test_bc_read test_bc_errors test_bc_other
+	@printf '\nAll bc tests passed.\n\n$(TEST_STARS)\n'

-test_dc:
-	%%DC_TEST%%
+test_bc_tests:%%BC_TESTS%%

-time_test: time_test_bc timeconst time_test_dc
+test_bc_scripts:%%BC_SCRIPT_TESTS%%

-time_test_bc:
-	%%BC_TIME_TEST%%
+test_bc_stdin:
+	@sh tests/stdin.sh bc %%BC_TEST_EXEC%%

-time_test_dc:
-	%%DC_TIME_TEST%%
+test_bc_read:
+	@sh tests/read.sh bc %%BC_TEST_EXEC%%
+
+test_bc_errors:
+	@sh tests/errors.sh bc %%BC_TEST_EXEC%%
+
+test_bc_other:
+	@sh tests/other.sh bc %%BC_TEST_EXEC%%
+
+test_bc_header:
+	@printf '$(TEST_STARS)\n\nRunning bc tests...\n\n'
+
+test_dc: test_dc_header test_dc_tests test_dc_scripts test_dc_stdin test_dc_read test_dc_errors test_dc_other
+	@printf '\nAll dc tests passed.\n\n$(TEST_STARS)\n'
+
+test_dc_tests:%%DC_TESTS%%
+
+test_dc_scripts:%%DC_SCRIPT_TESTS%%
+
+test_dc_stdin:
+	@sh tests/stdin.sh dc %%DC_TEST_EXEC%%
+
+test_dc_read:
+	@sh tests/read.sh dc %%DC_TEST_EXEC%%
+
+test_dc_errors:
+	@sh tests/errors.sh dc %%DC_TEST_EXEC%%
+
+test_dc_other:
+	@sh tests/other.sh dc %%DC_TEST_EXEC%%
+
+test_dc_header:
+	@printf '$(TEST_STARS)\n\nRunning dc tests...\n\n'

 timeconst:
 	%%TIMECONST%%

-library_test: library
+library_test: $(LIBBC)
 	$(CC) $(CFLAGS) $(BCL_TEST_C) $(LIBBC) -o $(BCL_TEST)

 test_library: library_test
 	$(BCL_TEST)

-valgrind: valgrind_bc valgrind_dc
-
-valgrind_bc:
-	%%VG_BC_TEST%%
-
-valgrind_dc:
-	%%VG_DC_TEST%%
-
 karatsuba:
 	%%KARATSUBA%%

@@ -296,6 +350,8 @@ clean:%%CLEAN_PREREQS%%
 	@$(RM) -f $(BC_LIB2_C) $(BC_LIB2_O)
 	@$(RM) -f $(BC_HELP_C) $(BC_HELP_O)
 	@$(RM) -f $(DC_HELP_C) $(DC_HELP_O)
+	@$(RM) -fr $(BC_TEST_OUTPUTS) $(DC_TEST_OUTPUTS)
+	@$(RM) -fr $(BC_FUZZ_OUTPUTS) $(DC_FUZZ_OUTPUTS)

 clean_config: clean
 	@printf 'Cleaning config...\n'
@@ -1,5 +1,86 @@
 # 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.
+
+There was a syntax error in `configure.sh` that the Linux shell did not catch,
+and FreeBSD depends on the existence of `tests/all.sh`.
+
+All users that already upgraded to `3.2.5` should update to this release, with
+my apologies for the poor release of `3.2.5`. Other users should skip `3.2.5` in
+favor of this version.
+
+## 3.2.5
+
+This is a production release that fixes several bugs and adds a couple small
+things.
+
+The two most important bugs were bugs that causes `dc` to access memory
+out-of-bounds (crash in debug builds). This was found by upgrading to `afl++`
+from `afl`. Both were caused by a failure to distinguish between the same two
+cases.
+
+Another bug was the failure to put all of the licenses in the `LICENSE.md` file.
+
+Third, some warnings by `scan-build` were found and eliminated. This needed one
+big change: `bc` and `dc` now bail out as fast as possible on fatal errors
+instead of unwinding the stack.
+
+Fourth, the pseudo-random number now attempts to seed itself with `/dev/random`
+if `/dev/urandom` fails.
+
+Finally, this release has a few quality-of-life changes to the build system. The
+usage should not change at all; the only thing that changed was making sure the
+`Makefile.in` was written to rebuild properly when headers changed and to not
+rebuild when not necessary.
+
 ## 3.2.4

 This is a production release that fixes a warning on `gcc` 6 or older, which
@@ -1,6 +1,6 @@
 # Notice

-Copyright 2018-2020 Gavin D. Howard and contributors.
+Copyright 2018-2021 Gavin D. Howard and contributors.

 ## Contributors

@@ -39,6 +39,7 @@ Systems that are known to work:
 * Mac OSX
 * Solaris* (as long as the Solaris version supports POSIX 2008)
 * AIX
+* HP-UX* (except for history)

 Please submit bug reports if this `bc` does not build out of the box on any
 system besides Windows. If Windows binaries are needed, they can be found at
@@ -341,7 +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
@@ -2,7 +2,7 @@
 #
 # SPDX-License-Identifier: BSD-2-Clause
 #
-# Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+# Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
@@ -33,6 +33,8 @@ script=$(basename "$script")

 . "$scriptdir/functions.sh"

+cd "$scriptdir"
+
 usage() {

 	if [ $# -gt 0 ]; then
@@ -48,7 +50,7 @@ usage() {
 	printf 'usage:\n'
 	printf '    %s -h\n' "$script"
 	printf '    %s --help\n' "$script"
-	printf '    %s [-a|-bD|-dB|-c] [-EfgGHlMNPT] [-O OPT_LEVEL] [-k KARATSUBA_LEN]\n' "$script"
+	printf '    %s [-a|-bD|-dB|-c] [-CEfgGHlmMNPtTvz] [-O OPT_LEVEL] [-k KARATSUBA_LEN]\n' "$script"
 	printf '    %s \\\n' "$script"
 	printf '       [--library|--bc-only --disable-dc|--dc-only --disable-bc|--coverage]\\\n'
 	printf '       [--force --debug --disable-extra-math --disable-generated-tests]    \\\n'
@@ -73,6 +75,8 @@ usage() {
 	printf '        Generate test coverage code. Requires gcov and regcovr.\n'
 	printf '        It is an error if either "-b" ("-D") or "-d" ("-B") is specified.\n'
 	printf '        Requires a compiler that use gcc-compatible coverage options\n'
+	printf '    -C, --disable-clean\n'
+	printf '        Disable the clean that configure.sh does before configure.\n'
 	printf '    -d, --dc-only\n'
 	printf '        Build dc only. It is an error if "-b", "--bc-only", "-D", or\n'
 	printf '        "--disable-dc" are specified too.\n'
@@ -107,6 +111,8 @@ usage() {
 	printf '        Installs all locales, regardless of how many are on the system. This\n'
 	printf '        option is useful for package maintainers who want to make sure that\n'
 	printf '        a package contains all of the locales that end users might need.\n'
+	printf '    -m, --enable-memcheck\n'
+	printf '        Enable memcheck mode, to ensure no memory leaks. For development only.\n'
 	printf '    -M, --disable-man-pages\n'
 	printf '        Disable installing manpages.\n'
 	printf '    -N, --disable-nls\n'
@@ -119,9 +125,15 @@ usage() {
 	printf '        Disables the prompt in the built bc. The prompt will never show up,\n'
 	printf '        or in other words, it will be permanently disabled and cannot be\n'
 	printf '        enabled.\n'
+	printf '    -t, --enable-test-timing\n'
+	printf '        Enable the timing of tests. This is for development only.\n'
 	printf '    -T, --disable-strip\n'
 	printf '        Disable stripping symbols from the compiled binary or binaries.\n'
 	printf '        Stripping symbols only happens when debug mode is off.\n'
+	printf '    -v, --enable-valgrind\n'
+	printf '        Enable a build appropriate for valgrind. For development only.\n'
+	printf '    -z, --enable-fuzz-mode\n'
+	printf '        Enable fuzzing mode. THIS IS FOR DEVELOPMENT ONLY.\n'
 	printf '    --prefix PREFIX\n'
 	printf '        The prefix to install to. Overrides "$PREFIX" if it exists.\n'
 	printf '        If PREFIX is "/usr", install path will be "/usr/bin".\n'
@@ -241,7 +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' "$_replace_ext_result"
 }
@@ -277,6 +289,23 @@ replace() {
 	substring_replace "$_replace_str" "%%$_replace_needle%%" "$_replace_replacement"
 }

+find_src_files() {
+
+	if [ "$#" -ge 1 ] && [ "$1" != "" ]; then
+
+		while [ "$#" -ge 1 ]; do
+			_find_src_files_a="${1## }"
+			shift
+			_find_src_files_args="$_find_src_files_args ! -path src/${_find_src_files_a}"
+		done
+
+	else
+		_find_src_files_args="-print"
+	fi
+
+	printf '%s\n' $(find src/ -depth -name "*.c" $_find_src_files_args)
+}
+
 gen_file_list() {

 	if [ "$#" -lt 1 ]; then
@@ -291,15 +320,9 @@ gen_file_list() {
 	cd "$scriptdir"

 	if [ "$#" -ge 1 ]; then
-
-		while [ "$#" -ge 1 ]; do
-			a="$1"
-			shift
-			args="$args ! -path src/${a}"
-		done
-
+		_gen_file_list_unneeded="$@"
 	else
-		args="-print"
+		_gen_file_list_unneeded=""
 	fi

 	_gen_file_list_needle_src="SRC"
@@ -307,7 +330,7 @@ gen_file_list() {
 	_gen_file_list_needle_gcda="GCDA"
 	_gen_file_list_needle_gcno="GCNO"

-	_gen_file_list_replacement=$(find src/ -depth -name "*.c" $args | tr '\n' ' ')
+	_gen_file_list_replacement=$(find_src_files $_gen_file_list_unneeded | tr '\n' ' ')
 	_gen_file_list_contents=$(replace "$_gen_file_list_contents" \
 		"$_gen_file_list_needle_src" "$_gen_file_list_replacement")

@@ -328,6 +351,101 @@ gen_file_list() {
 	printf '%s\n' "$_gen_file_list_contents"
 }

+gen_tests() {
+
+	_gen_tests_name="$1"
+	shift
+
+	_gen_tests_uname="$1"
+	shift
+
+	_gen_tests_extra_math="$1"
+	shift
+
+	_gen_tests_time_tests="$1"
+	shift
+
+	_gen_tests_extra_required=$(cat tests/extra_required.txt)
+
+	for _gen_tests_t in $(cat "$scriptdir/tests/$_gen_tests_name/all.txt"); do
+
+		if [ "$_gen_tests_extra_math" -eq 0 ]; then
+
+			if [ -z "${_gen_tests_extra_required##*$_gen_tests_t*}" ]; then
+				printf 'test_%s_%s:\n\t@printf "Skipping %s %s\\n"\n\n' \
+					"$_gen_tests_name" "$_gen_tests_t" "$_gen_tests_name" \
+					"$_gen_tests_t" >> "$scriptdir/Makefile"
+				continue
+			fi
+
+		fi
+
+		printf 'test_%s_%s:\n\t@sh tests/test.sh %s %s %s %s %s\n\n' \
+			"$_gen_tests_name" "$_gen_tests_t" "$_gen_tests_name" \
+			"$_gen_tests_t" "$generate_tests" "$time_tests" \
+			"$*" >> "$scriptdir/Makefile"
+
+	done
+}
+
+gen_test_targets() {
+
+	_gen_test_targets_name="$1"
+	shift
+
+	_gen_test_targets_tests=$(cat "$scriptdir/tests/${_gen_test_targets_name}/all.txt")
+
+	for _gen_test_targets_t in $_gen_test_targets_tests; do
+		printf ' test_%s_%s' "$_gen_test_targets_name" "$_gen_test_targets_t"
+	done
+
+	printf '\n'
+}
+
+gen_script_tests() {
+
+	_gen_script_tests_name="$1"
+	shift
+
+	_gen_script_tests_extra_math="$1"
+	shift
+
+	_gen_script_tests_generate="$1"
+	shift
+
+	_gen_script_tests_time="$1"
+	shift
+
+	_gen_script_tests_tests=$(cat "$scriptdir/tests/$_gen_script_tests_name/scripts/all.txt")
+
+	for _gen_script_tests_f in $_gen_script_tests_tests; do
+
+		_gen_script_tests_b=$(basename "$_gen_script_tests_f" ".${_gen_script_tests_name}")
+
+		printf 'test_%s_script_%s:\n\t@sh tests/script.sh %s %s %s 1 %s %s %s\n\n' \
+			"$_gen_script_tests_name" "$_gen_script_tests_b" "$_gen_script_tests_name" \
+			"$_gen_script_tests_f" "$_gen_script_tests_extra_math" "$_gen_script_tests_generate" \
+			"$_gen_script_tests_time" "$*" >> "$scriptdir/Makefile"
+	done
+}
+
+gen_script_test_targets() {
+
+	_gen_script_test_targets_name="$1"
+	shift
+
+	_gen_script_test_targets_tests=$(cat "$scriptdir/tests/$_gen_script_test_targets_name/scripts/all.txt")
+
+	for _gen_script_test_targets_f in $_gen_script_test_targets_tests; do
+		_gen_script_test_targets_b=$(basename "$_gen_script_test_targets_f" \
+			".$_gen_script_test_targets_name")
+		printf ' test_%s_script_%s' "$_gen_script_test_targets_name" \
+			"$_gen_script_test_targets_b"
+	done
+
+	printf '\n'
+}
+
 bc_only=0
 dc_only=0
 coverage=0
@@ -344,14 +462,20 @@ force=0
 strip_bin=1
 all_locales=0
 library=0
+fuzz=0
+time_tests=0
+vg=0
+memcheck=0
+clean=1

-while getopts "abBcdDEfgGhHk:lMNO:PST-" opt; do
+while getopts "abBcdDEfgGhHk:lMmNO:PStTvz-" opt; do

 	case "$opt" in
 		a) library=1 ;;
 		b) bc_only=1 ;;
 		B) dc_only=1 ;;
 		c) coverage=1 ;;
+		C) clean=0 ;;
 		d) dc_only=1 ;;
 		D) bc_only=1 ;;
 		E) extra_math=0 ;;
@@ -362,11 +486,15 @@ while getopts "abBcdDEfgGhHk:lMNO:PST-" opt; do
 		H) hist=0 ;;
 		k) karatsuba_len="$OPTARG" ;;
 		l) all_locales=1 ;;
+		m) memcheck=1 ;;
 		M) install_manpages=0 ;;
 		N) nls=0 ;;
 		O) optimization="$OPTARG" ;;
 		P) prompt=0 ;;
+		t) time_tests=1 ;;
 		T) strip_bin=0 ;;
+		v) vg=1 ;;
+		z) fuzz=1 ;;
 		-)
 			arg="$1"
 			arg="${arg#--}"
@@ -465,6 +593,7 @@ while getopts "abBcdDEfgGhHk:lMNO:PST-" opt; do
 					shift ;;
 				disable-bc) dc_only=1 ;;
 				disable-dc) bc_only=1 ;;
+				disable-clean) clean=0 ;;
 				disable-extra-math) extra_math=0 ;;
 				disable-generated-tests) generate_tests=0 ;;
 				disable-history) hist=0 ;;
@@ -472,16 +601,24 @@ while getopts "abBcdDEfgGhHk:lMNO:PST-" opt; do
 				disable-nls) nls=0 ;;
 				disable-prompt) prompt=0 ;;
 				disable-strip) strip_bin=0 ;;
+				enable-test-timing) time_tests=1 ;;
+				enable-valgrind) vg=1 ;;
+				enable-fuzz-mode) fuzz=1 ;;
+				enable-memcheck) memcheck=1 ;;
 				install-all-locales) all_locales=1 ;;
 				help* | bc-only* | dc-only* | coverage* | debug*)
 					usage "No arg allowed for --$arg option" ;;
-				disable-bc* | disable-dc* | disable-extra-math*)
+				disable-bc* | disable-dc* | disable-clean*)
+					usage "No arg allowed for --$arg option" ;;
+				disable-extra-math*)
 					usage "No arg allowed for --$arg option" ;;
 				disable-generated-tests* | disable-history*)
 					usage "No arg allowed for --$arg option" ;;
 				disable-man-pages* | disable-nls* | disable-strip*)
 					usage "No arg allowed for --$arg option" ;;
-				install-all-locales*)
+				enable-fuzz-mode* | enable-test-timing* | enable-valgrind*)
+					usage "No arg allowed for --$arg option" ;;
+				enable-memcheck* | install-all-locales*)
 					usage "No arg allowed for --$arg option" ;;
 				'') break ;; # "--" terminates argument processing
 				* ) usage "Invalid option $LONG_OPTARG" ;;
@@ -493,6 +630,12 @@ while getopts "abBcdDEfgGhHk:lMNO:PST-" opt; do

 done

+if [ "$clean" -ne 0 ]; then
+	if [ -f ./Makefile ]; then
+		make clean_config > /dev/null
+	fi
+fi
+
 if [ "$bc_only" -eq 1 ] && [ "$dc_only" -eq 1 ]; then
 	usage "Can only specify one of -b(-D) or -d(-B)"
 fi
@@ -581,21 +724,19 @@ executable="BC_EXEC"
 tests="test_bc timeconst test_dc"

 bc_test="@tests/all.sh bc $extra_math 1 $generate_tests 0 \$(BC_EXEC)"
-bc_time_test="@tests/all.sh bc $extra_math 1 $generate_tests 1 \$(BC_EXEC)"
-
 dc_test="@tests/all.sh dc $extra_math 1 $generate_tests 0 \$(DC_EXEC)"
-dc_time_test="@tests/all.sh dc $extra_math 1 $generate_tests 1 \$(DC_EXEC)"

 timeconst="@tests/bc/timeconst.sh tests/bc/scripts/timeconst.bc \$(BC_EXEC)"

 # In order to have cleanup at exit, we need to be in
 # debug mode, so don't run valgrind without that.
-if [ "$debug" -ne 0 ]; then
-	vg_bc_test="@tests/all.sh bc $extra_math 1 $generate_tests 0 valgrind \$(VALGRIND_ARGS) \$(BC_EXEC)"
-	vg_dc_test="@tests/all.sh dc $extra_math 1 $generate_tests 0 valgrind \$(VALGRIND_ARGS) \$(DC_EXEC)"
+if [ "$vg" -ne 0 ]; then
+	debug=1
+	bc_test_exec='valgrind $(VALGRIND_ARGS) $(BC_EXEC)'
+	dc_test_exec='valgrind $(VALGRIND_ARGS) $(DC_EXEC)'
 else
-	vg_bc_test="@printf 'Cannot run valgrind without debug flags\\\\n'"
-	vg_dc_test="@printf 'Cannot run valgrind without debug flags\\\\n'"
+	bc_test_exec='$(BC_EXEC)'
+	dc_test_exec='$(DC_EXEC)'
 fi

 karatsuba="@printf 'karatsuba cannot be run because one of bc or dc is not built\\\\n'"
@@ -605,7 +746,29 @@ bc_lib="\$(GEN_DIR)/lib.o"
 bc_help="\$(GEN_DIR)/bc_help.o"
 dc_help="\$(GEN_DIR)/dc_help.o"

-if [ "$bc_only" -eq 1 ]; then
+default_target_prereqs="\$(BIN) \$(OBJS)"
+default_target_cmd="\$(CC) \$(CFLAGS) \$(OBJS) \$(LDFLAGS) -o \$(EXEC)"
+default_target="\$(DC_EXEC)"
+
+second_target_prereqs=""
+second_target_cmd="$default_target_cmd"
+second_target="\$(BC_EXEC)"
+
+if [ "$library" -ne 0 ]; then
+
+	extra_math=1
+	nls=0
+	hist=0
+	prompt=0
+	bc=1
+	dc=1
+
+	default_target_prereqs="\$(BIN) \$(OBJ)"
+	default_target_cmd="ar -r -cu \$(LIBBC) \$(OBJ)"
+	default_target="\$(LIBBC)"
+	tests="test_library"
+
+elif [ "$bc_only" -eq 1 ]; then

 	bc=1
 	dc=0
@@ -615,14 +778,16 @@ if [ "$bc_only" -eq 1 ]; then
 	executables="bc"

 	dc_test="@printf 'No dc tests to run\\\\n'"
-	dc_time_test="@printf 'No dc tests to run\\\\n'"
-	vg_dc_test="@printf 'No dc tests to run\\\\n'"

 	install_prereqs=" install_execs"
 	install_man_prereqs=" install_bc_manpage"
 	uninstall_prereqs=" uninstall_bc"
 	uninstall_man_prereqs=" uninstall_bc_manpage"

+	default_target="\$(BC_EXEC)"
+	second_target="\$(DC_EXEC)"
+	tests="test_bc timeconst"
+
 elif [ "$dc_only" -eq 1 ]; then

 	bc=0
@@ -637,8 +802,6 @@ elif [ "$dc_only" -eq 1 ]; then
 	executable="DC_EXEC"

 	bc_test="@printf 'No bc tests to run\\\\n'"
-	bc_time_test="@printf 'No bc tests to run\\\\n'"
-	vg_bc_test="@printf 'No bc tests to run\\\\n'"

 	timeconst="@printf 'timeconst cannot be run because bc is not built\\\\n'"

@@ -647,6 +810,8 @@ elif [ "$dc_only" -eq 1 ]; then
 	uninstall_prereqs=" uninstall_dc"
 	uninstall_man_prereqs=" uninstall_dc_manpage"

+	tests="test_dc"
+
 else

 	bc=1
@@ -654,8 +819,6 @@ else

 	executables="bc and dc"

-	link="\$(LINK) \$(BIN) \$(EXEC_PREFIX)\$(DC)"
-
 	karatsuba="@\$(KARATSUBA) 30 0 \$(BC_EXEC)"
 	karatsuba_test="@\$(KARATSUBA) 1 100 \$(BC_EXEC)"

@@ -672,6 +835,18 @@ else
 		tests="test_library"
 	fi

+	second_target_prereqs="$default_target_prereqs"
+	default_target_prereqs="$second_target"
+	default_target_cmd="\$(LINK) \$(BIN) \$(EXEC_PREFIX)\$(DC)"
+
+fi
+
+if [ "$fuzz" -ne 0 ]; then
+	debug=1
+	hist=0
+	prompt=0
+	nls=0
+	optimization="3"
 fi

 if [ "$debug" -eq 1 ]; then
@@ -763,16 +938,6 @@ else
 	uninstall_man_prereqs=""
 fi

-if [ "$library" -ne 0 ]; then
-	extra_math=1
-	nls=0
-	hist=0
-	prompt=0
-	ALL_PREREQ="library"
-else
-	ALL_PREREQ="execs"
-fi
-
 if [ "$nls" -ne 0 ]; then

 	set +e
@@ -913,13 +1078,21 @@ else
 fi

 manpage_args=""
+unneeded=""
+headers="\$(HEADERS)"

 if [ "$extra_math" -eq 0 ]; then
 	manpage_args="E"
+	unneeded="$unneeded rand.c"
+else
+	headers="$headers \$(EXTRA_MATH_HEADERS)"
 fi

 if [ "$hist" -eq 0 ]; then
 	manpage_args="${manpage_args}H"
+	unneeded="$unneeded history.c"
+else
+	headers="$headers \$(HISTORY_HEADERS)"
 fi

 if [ "$nls" -eq 0 ]; then
@@ -930,26 +1103,16 @@ if [ "$prompt" -eq 0 ]; then
 	manpage_args="${manpage_args}P"
 fi

-if [ "$manpage_args" = "" ]; then
-	manpage_args="A"
-fi
-
-unneeded=""
-
-if [ "$hist" -eq 0 ]; then
-	unneeded="$unneeded history.c"
-fi
-
 if [ "$bc" -eq 0 ]; then
 	unneeded="$unneeded bc.c bc_lex.c bc_parse.c"
+else
+	headers="$headers \$(BC_HEADERS)"
 fi

 if [ "$dc" -eq 0 ]; then
 	unneeded="$unneeded dc.c dc_lex.c dc_parse.c"
-fi
-
-if [ "$extra_math" -eq 0 ]; then
-	unneeded="$unneeded rand.c"
+else
+	headers="$headers \$(DC_HEADERS)"
 fi

 if [ "$library" -ne 0 ]; then
@@ -957,10 +1120,24 @@ if [ "$library" -ne 0 ]; then
 	unneeded="$unneeded lang.c lex.c parse.c program.c"
 	unneeded="$unneeded bc.c bc_lex.c bc_parse.c"
 	unneeded="$unneeded dc.c dc_lex.c dc_parse.c"
+	headers="$headers \$(LIBRARY_HEADERS)"
 else
 	unneeded="$unneeded library.c"
 fi

+if [ "$manpage_args" = "" ]; then
+	manpage_args="A"
+fi
+
+if [ "$vg" -ne 0 ]; then
+	memcheck=1
+fi
+
+bc_tests=$(gen_test_targets bc)
+bc_script_tests=$(gen_script_test_targets bc)
+dc_tests=$(gen_test_targets dc)
+dc_script_tests=$(gen_script_test_targets dc)
+
 # Print out the values; this is for debugging.
 if [ "$bc" -ne 0 ]; then
 	printf 'Building bc\n'
@@ -978,6 +1155,7 @@ printf 'BC_ENABLE_HISTORY=%s\n' "$hist"
 printf 'BC_ENABLE_EXTRA_MATH=%s\n' "$extra_math"
 printf 'BC_ENABLE_NLS=%s\n' "$nls"
 printf 'BC_ENABLE_PROMPT=%s\n' "$prompt"
+printf 'BC_ENABLE_AFL=%s\n' "$fuzz"
 printf '\n'
 printf 'BC_NUM_KARATSUBA_LEN=%s\n' "$karatsuba_len"
 printf '\n'
@@ -1012,20 +1190,45 @@ replacement='*** WARNING: Autogenerated from Makefile.in. DO NOT MODIFY ***'
 contents=$(replace "$contents" "$needle" "$replacement")

 if [ "$unneeded" = "" ]; then
-	contents=$(gen_file_list "$contents" "library.c")
-else
-	contents=$(gen_file_list "$contents" $unneeded)
+	unneeded="library.c"
 fi

+contents=$(gen_file_list "$contents" $unneeded)
+
+SRC_TARGETS=""
+
+src_files=$(find_src_files $unneeded)
+
+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" "$f")
+done
+
+contents=$(replace "$contents" "HEADERS" "$headers")
+
 contents=$(replace "$contents" "BC_ENABLED" "$bc")
 contents=$(replace "$contents" "DC_ENABLED" "$dc")
-contents=$(replace "$contents" "LINK" "$link")
+
+contents=$(replace "$contents" "BC_ALL_TESTS" "$bc_test")
+contents=$(replace "$contents" "BC_TESTS" "$bc_tests")
+contents=$(replace "$contents" "BC_SCRIPT_TESTS" "$bc_script_tests")
+contents=$(replace "$contents" "BC_TEST_EXEC" "$bc_test_exec")
+contents=$(replace "$contents" "TIMECONST_ALL_TESTS" "$timeconst")
+
+contents=$(replace "$contents" "DC_ALL_TESTS" "$dc_test")
+contents=$(replace "$contents" "DC_TESTS" "$dc_tests")
+contents=$(replace "$contents" "DC_SCRIPT_TESTS" "$dc_script_tests")
+contents=$(replace "$contents" "DC_TEST_EXEC" "$dc_test_exec")

 contents=$(replace "$contents" "LIBRARY" "$library")
 contents=$(replace "$contents" "HISTORY" "$hist")
 contents=$(replace "$contents" "EXTRA_MATH" "$extra_math")
 contents=$(replace "$contents" "NLS" "$nls")
 contents=$(replace "$contents" "PROMPT" "$prompt")
+contents=$(replace "$contents" "FUZZ" "$fuzz")
+contents=$(replace "$contents" "MEMCHECK" "$memcheck")
+
 contents=$(replace "$contents" "BC_LIB_O" "$bc_lib")
 contents=$(replace "$contents" "BC_HELP_O" "$bc_help")
 contents=$(replace "$contents" "DC_HELP_O" "$dc_help")
@@ -1057,7 +1260,18 @@ contents=$(replace "$contents" "UNINSTALL_MAN_PREREQS" "$uninstall_man_prereqs")
 contents=$(replace "$contents" "UNINSTALL_PREREQS" "$uninstall_prereqs")
 contents=$(replace "$contents" "UNINSTALL_LOCALES_PREREQS" "$uninstall_locales_prereqs")

+contents=$(replace "$contents" "DEFAULT_TARGET" "$default_target")
+contents=$(replace "$contents" "DEFAULT_TARGET_PREREQS" "$default_target_prereqs")
+contents=$(replace "$contents" "DEFAULT_TARGET_CMD" "$default_target_cmd")
+contents=$(replace "$contents" "SECOND_TARGET" "$second_target")
+contents=$(replace "$contents" "SECOND_TARGET_PREREQS" "$second_target_prereqs")
+contents=$(replace "$contents" "SECOND_TARGET_CMD" "$second_target_cmd")
+
 contents=$(replace "$contents" "ALL_PREREQ" "$ALL_PREREQ")
+contents=$(replace "$contents" "BC_EXEC_PREREQ" "$bc_exec_prereq")
+contents=$(replace "$contents" "BC_EXEC_CMD" "$bc_exec_cmd")
+contents=$(replace "$contents" "DC_EXEC_PREREQ" "$dc_exec_prereq")
+contents=$(replace "$contents" "DC_EXEC_CMD" "$dc_exec_cmd")

 contents=$(replace "$contents" "EXECUTABLES" "$executables")
 contents=$(replace "$contents" "MAIN_EXEC" "$main_exec")
@@ -1065,10 +1279,7 @@ contents=$(replace "$contents" "EXEC" "$executable")
 contents=$(replace "$contents" "TESTS" "$tests")

 contents=$(replace "$contents" "BC_TEST" "$bc_test")
-contents=$(replace "$contents" "BC_TIME_TEST" "$bc_time_test")
-
 contents=$(replace "$contents" "DC_TEST" "$dc_test")
-contents=$(replace "$contents" "DC_TIME_TEST" "$dc_time_test")

 contents=$(replace "$contents" "VG_BC_TEST" "$vg_bc_test")
 contents=$(replace "$contents" "VG_DC_TEST" "$vg_dc_test")
@@ -1086,7 +1297,17 @@ contents=$(replace "$contents" "GEN_EXEC_TARGET" "$GEN_EXEC_TARGET")
 contents=$(replace "$contents" "CLEAN_PREREQS" "$CLEAN_PREREQS")
 contents=$(replace "$contents" "GEN_EMU" "$GEN_EMU")

-printf '%s\n' "$contents" > "$scriptdir/Makefile"
+printf '%s\n%s\n\n' "$contents" "$SRC_TARGETS" > "$scriptdir/Makefile"
+
+if [ "$bc" -ne 0 ]; then
+	gen_tests bc BC "$extra_math" "$time_tests" $bc_test_exec
+	gen_script_tests bc "$extra_math" "$generate_tests" "$time_tests" $bc_test_exec
+fi
+
+if [ "$dc" -ne 0 ]; then
+	gen_tests dc DC "$extra_math" "$time_tests" $dc_test_exec
+	gen_script_tests dc "$extra_math" "$generate_tests" "$time_tests" $dc_test_exec
+fi

 cd "$scriptdir"

@@ -2,7 +2,7 @@
 #
 # SPDX-License-Identifier: BSD-2-Clause
 #
-# Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+# Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
@@ -2,7 +2,7 @@
 #
 # SPDX-License-Identifier: BSD-2-Clause
 #
-# Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+# Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
@@ -59,10 +59,56 @@ err_exit() {
 	fi

 	printf '%s\n' "$1"
-	printf '\nexiting...\n'
 	exit "$2"
 }

+checktest_retcode() {
+
+	_checktest_retcode_d="$1"
+	shift
+
+	_checktest_retcode_err="$1"
+	shift
+
+	_checktest_retcode_name="$1"
+	shift
+
+	if [ "$_checktest_retcode_err" -ne 0 ]; then
+		printf 'FAIL!!!\n'
+		err_exit "$_checktest_retcode_d failed test '$_checktest_retcode_name' with error code $_checktest_retcode_err" 1
+	fi
+}
+
+checktest() {
+
+	_checktest_d="$1"
+	shift
+
+	_checktest_err="$1"
+	shift
+
+	_checktest_name="$1"
+	shift
+
+	_checktest_test_path="$1"
+	shift
+
+	_checktest_results_name="$1"
+	shift
+
+	checktest_retcode "$_checktest_d" "$_checktest_err" "$_checktest_name"
+
+	_checktest_diff=$(diff "$_checktest_test_path" "$_checktest_results_name")
+
+	_checktest_err="$?"
+
+	if [ "$_checktest_err" -ne 0 ]; then
+		printf 'FAIL!!!\n'
+		printf '%s\n' "$_checktest_diff"
+		err_exit "$_checktest_d failed test $_checktest_name" 1
+	fi
+}
+
 die() {

 	_die_d="$1"
@@ -99,49 +145,49 @@ checkcrash() {
 	fi
 }

-checktest()
+checkerrtest()
 {
-	_checktest_d="$1"
+	_checkerrtest_d="$1"
 	shift

-	_checktest_error="$1"
+	_checkerrtest_error="$1"
 	shift

-	_checktest_name="$1"
+	_checkerrtest_name="$1"
 	shift

-	_checktest_out="$1"
+	_checkerrtest_out="$1"
 	shift

-	_checktest_exebase="$1"
+	_checkerrtest_exebase="$1"
 	shift

-	checkcrash "$_checktest_d" "$_checktest_error" "$_checktest_name"
+	checkcrash "$_checkerrtest_d" "$_checkerrtest_error" "$_checkerrtest_name"

-	if [ "$_checktest_error" -eq 0 ]; then
-		die "$_checktest_d" "returned no error" "$_checktest_name" 127
+	if [ "$_checkerrtest_error" -eq 0 ]; then
+		die "$_checkerrtest_d" "returned no error" "$_checkerrtest_name" 127
 	fi

-	if [ "$_checktest_error" -eq 100 ]; then
+	if [ "$_checkerrtest_error" -eq 100 ]; then

-		_checktest_output=$(cat "$_checktest_out")
-		_checktest_fatal_error="Fatal error"
+		_checkerrtest_output=$(cat "$_checkerrtest_out")
+		_checkerrtest_fatal_error="Fatal error"

-		if [ "${_checktest_output##*$_checktest_fatal_error*}" ]; then
-			printf "%s\n" "$_checktest_output"
-			die "$_checktest_d" "had memory errors on a non-fatal error" \
-				"$_checktest_name" "$_checktest_error"
+		if [ "${_checkerrtest_output##*$_checkerrtest_fatal_error*}" ]; then
+			printf "%s\n" "$_checkerrtest_output"
+			die "$_checkerrtest_d" "had memory errors on a non-fatal error" \
+				"$_checkerrtest_name" "$_checkerrtest_error"
 		fi
 	fi

-	if [ ! -s "$_checktest_out" ]; then
-		die "$_checktest_d" "produced no error message" "$_checktest_name" "$_checktest_error"
+	if [ ! -s "$_checkerrtest_out" ]; then
+		die "$_checkerrtest_d" "produced no error message" "$_checkerrtest_name" "$_checkerrtest_error"
 	fi

 	# Display the error messages if not directly running exe.
 	# This allows the script to print valgrind output.
-	if [ "$_checktest_exebase" != "bc" -a "$_checktest_exebase" != "dc" ]; then
-		cat "$_checktest_out"
+	if [ "$_checkerrtest_exebase" != "bc" -a "$_checkerrtest_exebase" != "dc" ]; then
+		cat "$_checkerrtest_out"
 	fi
 }

@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -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
@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -43,7 +43,7 @@
 #include <libgen.h>

 static const char* const bc_gen_header =
-	"// Copyright (c) 2018-2020 Gavin D. Howard and contributors.\n"
+	"// Copyright (c) 2018-2021 Gavin D. Howard and contributors.\n"
 	"// Licensed under the 2-clause BSD license.\n"
 	"// *** AUTOMATICALLY GENERATED FROM %s. DO NOT MODIFY. ***\n\n";

@@ -2,7 +2,7 @@
 #
 # SPDX-License-Identifier: BSD-2-Clause
 #
-# Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+# Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
@@ -64,7 +64,7 @@ if [ -n "$remove_tabs" ]; then
 fi

 cat<<EOF
-// Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+// Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 // Licensed under the 2-clause BSD license.
 // *** AUTOMATICALLY GENERATED FROM ${input}. DO NOT MODIFY. ***

@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -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;

@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -236,7 +236,9 @@ void bc_num_zero(BcNum *restrict n);
 void bc_num_one(BcNum *restrict n);
 ssize_t bc_num_cmpZero(const BcNum *n);

+#if !defined(NDEBUG) || BC_ENABLE_LIBRARY
 bool bc_num_strValid(const char *restrict val);
+#endif // !defined(NDEBUG) || BC_ENABLE_LIBRARY
 void bc_num_parse(BcNum *restrict n, const char *restrict val, BcBigDig base);
 void bc_num_print(BcNum *restrict n, BcBigDig base, bool newline);
 #if DC_ENABLED
@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -1,32 +1,4 @@
 /*
- * *****************************************************************************
- *
- * SPDX-License-Identifier: BSD-2-Clause
- *
- * Copyright (c) 2018-2019 Gavin D. Howard and contributors.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * * Redistributions of source code must retain the above copyright notice, this
- *   list of conditions and the following disclaimer.
- *
- * * Redistributions in binary form must reproduce the above copyright notice,
- *   this list of conditions and the following disclaimer in the documentation
- *   and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
 * *****************************************************************************
 *
 * Parts of this code are adapted from the following:
@@ -38,9 +10,10 @@
 *
 * -----------------------------------------------------------------------------
 *
- * Parts of this code are also under the following license:
+ * This code is under the following license:
 *
 * Copyright (c) 2014-2017 Melissa O'Neill and PCG Project contributors
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -46,6 +46,16 @@
 #define DC_ENABLED (1)
 #endif // DC_ENABLED

+#if BC_ENABLE_AFL
+#ifndef __AFL_HAVE_MANUAL_CONTROL
+#error Must compile with afl-clang-fast for fuzzing
+#endif // __AFL_HAVE_MANUAL_CONTROL
+#endif // BC_ENABLE_AFL
+
+#ifndef BC_ENABLE_MEMCHECK
+#define BC_ENABLE_MEMCHECK (0)
+#endif // BC_ENABLE_MEMCHECK
+
 #include <bcl.h>

 typedef enum BcStatus {
@@ -166,14 +176,18 @@ 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__)
+#endif // defined(__clang__) || defined(__GNUC__)

 // Workarounds for AIX's POSIX incompatibility.
 #ifndef SIZE_MAX
@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -91,6 +91,7 @@ bool bc_map_insert(BcVec *restrict v, const char *name,
 size_t bc_map_index(const BcVec *restrict v, const char *name);

 #define bc_vec_pop(v) (bc_vec_npop((v), 1))
+#define bc_vec_popAll(v) (bc_vec_npop((v), (v)->len))
 #define bc_vec_top(v) (bc_vec_item_rev((v), 0))

 #ifndef NDEBUG
@@ -3,7 +3,7 @@
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
- * Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
@@ -318,7 +318,7 @@ typedef struct BcVm {
 #if !BC_ENABLE_LIBRARY
 	BcParse prs;
 	BcProgram prog;
-#endif // BC_ENABLE_LIBRARY
+#endif // !BC_ENABLE_LIBRARY

 	BcVec jmp_bufs;

@@ -343,7 +343,7 @@ typedef struct BcVm {
 	const char* file;

 	const char *sigmsg;
-#endif // BC_ENABLE_LIBRARY
+#endif // !BC_ENABLE_LIBRARY
 	volatile sig_atomic_t sig_lock;
 	volatile sig_atomic_t sig;
 #if !BC_ENABLE_LIBRARY
@@ -356,8 +356,9 @@ typedef struct BcVm {
 	uint16_t line_len;

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

 	BcBigDig maxes[BC_PROG_GLOBALS_LEN + BC_ENABLE_EXTRA_MATH];

@@ -382,7 +383,7 @@ typedef struct BcVm {
 	const char *err_msgs[BC_ERR_NELEMS];

 	const char *locale;
-#endif // BC_ENABLE_LIBRARY
+#endif // !BC_ENABLE_LIBRARY

 	BcBigDig last_base;
 	BcBigDig last_pow;
@@ -392,7 +393,7 @@ typedef struct BcVm {
 #if !BC_ENABLE_LIBRARY
 	char *env_args_buffer;
 	BcVec env_args;
-#endif // BC_ENABLE_LIBRARY
+#endif // !BC_ENABLE_LIBRARY

 	BcNum max;
 	BcNum max2;
@@ -436,8 +437,15 @@ void bc_vm_jmp(void);

 #if BC_ENABLE_LIBRARY
 void bc_vm_handleError(BcErr e);
+void bc_vm_fatalError(BcErr e);
+void bc_vm_atexit(void);
 #else // BC_ENABLE_LIBRARY
 void bc_vm_handleError(BcErr e, size_t line, ...);
+#if !BC_ENABLE_LIBRARY && !BC_ENABLE_MEMCHECK
+BC_NORETURN
+#endif // !BC_ENABLE_LIBRARY && !BC_ENABLE_MEMCHECK
+void bc_vm_fatalError(BcErr e);
+int bc_vm_atexit(int status);
 #endif // BC_ENABLE_LIBRARY

 extern const char bc_copyright[];
@@ -2,7 +2,7 @@
 #
 # SPDX-License-Identifier: BSD-2-Clause
 #
-# Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+# Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
@@ -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
@@ -2,7 +2,7 @@
 #
 # SPDX-License-Identifier: BSD-2-Clause
 #
-# Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+# Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
@@ -2,7 +2,7 @@
 #
 # SPDX-License-Identifier: BSD-2-Clause
 #
-# Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+# Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
@@ -2,7 +2,7 @@
 #
 # SPDX-License-Identifier: BSD-2-Clause
 #
-# Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+# Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -1,7 +1,7 @@
 $ $
 $ SPDX-License-Identifier: BSD-2-Clause
 $ $
-$ Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+$ Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 $ $
 $ Redistribution and use in source and binary forms, with or without
 $ modification, are permitted provided that the following conditions are met:
@@ -2,7 +2,7 @@
 #
 # SPDX-License-Identifier: BSD-2-Clause
 #
-# Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+# Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
@@ -2,7 +2,7 @@

 SPDX-License-Identifier: BSD-2-Clause

-Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+Copyright (c) 2018-2021 Gavin D. Howard and contributors.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
@@ -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.
@@ -459,7 +467,10 @@ generator.
 **Note**: The values returned by the pseudo-random number generator with
 **rand()** and **irand(E)** 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.
+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
+reproducible stream of pseudo-random numbers is *ESSENTIAL*. In any other case,
+use a non-seeded pseudo-random number generator.
 {{ end }}

 ## Numbers
@@ -500,7 +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

@@ -605,7 +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
@@ -950,12 +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 }}

@@ -1008,8 +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**.
@@ -1693,17 +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**
@@ -1,7 +1,7 @@
 .\"
 .\" SPDX-License-Identifier: BSD-2-Clause
 .\"
-.\" Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+.\" Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions are met:
@@ -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" "October 2020" "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].
@@ -519,6 +531,10 @@ generator with \f[B]rand()\f[R] and \f[B]irand(E)\f[R] are guaranteed to
 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
+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.
 .SS Numbers
 .PP
 Numbers are strings made up of digits, uppercase letters, and at most
@@ -565,7 +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
@@ -675,7 +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]
@@ -1121,7 +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.
@@ -1182,7 +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
@@ -1940,11 +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
@@ -1952,7 +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
@@ -2,7 +2,7 @@

 SPDX-License-Identifier: BSD-2-Clause

-Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+Copyright (c) 2018-2021 Gavin D. Howard and contributors.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
@@ -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.
@@ -403,7 +411,10 @@ generator.
 **Note**: The values returned by the pseudo-random number generator with
 **rand()** and **irand(E)** 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.
+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
+reproducible stream of pseudo-random numbers is *ESSENTIAL*. In any other case,
+use a non-seeded pseudo-random number generator.

 ## Numbers

@@ -441,7 +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

@@ -539,7 +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
@@ -870,7 +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.

@@ -922,8 +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**.
@@ -1591,17 +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**
@@ -1,7 +1,7 @@
 .\"
 .\" SPDX-License-Identifier: BSD-2-Clause
 .\"
-.\" Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+.\" Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions are met:
@@ -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" "October 2020" "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
@@ -2,7 +2,7 @@

 SPDX-License-Identifier: BSD-2-Clause

-Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+Copyright (c) 2018-2021 Gavin D. Howard and contributors.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
@@ -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**
@@ -1,7 +1,7 @@
 .\"
 .\" SPDX-License-Identifier: BSD-2-Clause
 .\"
-.\" Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+.\" Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions are met:
@@ -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" "October 2020" "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
@@ -2,7 +2,7 @@

 SPDX-License-Identifier: BSD-2-Clause

-Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+Copyright (c) 2018-2021 Gavin D. Howard and contributors.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
@@ -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**
@@ -1,7 +1,7 @@
 .\"
 .\" SPDX-License-Identifier: BSD-2-Clause
 .\"
-.\" Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+.\" Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions are met:
@@ -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" "October 2020" "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
@@ -2,7 +2,7 @@

 SPDX-License-Identifier: BSD-2-Clause

-Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+Copyright (c) 2018-2021 Gavin D. Howard and contributors.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
@@ -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**
@@ -1,7 +1,7 @@
 .\"
 .\" SPDX-License-Identifier: BSD-2-Clause
 .\"
-.\" Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+.\" Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions are met:
@@ -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" "October 2020" "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
@@ -2,7 +2,7 @@

 SPDX-License-Identifier: BSD-2-Clause

-Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+Copyright (c) 2018-2021 Gavin D. Howard and contributors.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
@@ -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**
@@ -1,7 +1,7 @@
 .\"
 .\" SPDX-License-Identifier: BSD-2-Clause
 .\"
-.\" Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+.\" Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions are met:
@@ -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" "October 2020" "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
@@ -2,7 +2,7 @@

 SPDX-License-Identifier: BSD-2-Clause

-Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+Copyright (c) 2018-2021 Gavin D. Howard and contributors.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
@@ -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**
@@ -1,7 +1,7 @@
 .\"
 .\" SPDX-License-Identifier: BSD-2-Clause
 .\"
-.\" Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+.\" Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions are met:
@@ -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" "October 2020" "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
@@ -2,7 +2,7 @@

 SPDX-License-Identifier: BSD-2-Clause

-Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+Copyright (c) 2018-2021 Gavin D. Howard and contributors.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
@@ -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**
@@ -1,7 +1,7 @@
 .\"
 .\" SPDX-License-Identifier: BSD-2-Clause
 .\"
-.\" Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+.\" Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions are met:
@@ -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" "October 2020" "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
@@ -2,7 +2,7 @@

 SPDX-License-Identifier: BSD-2-Clause

-Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+Copyright (c) 2018-2021 Gavin D. Howard and contributors.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
@@ -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**
@@ -1,7 +1,7 @@
 .\"
 .\" SPDX-License-Identifier: BSD-2-Clause
 .\"
-.\" Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+.\" Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions are met:
@@ -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" "October 2020" "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
@@ -2,7 +2,7 @@

 SPDX-License-Identifier: BSD-2-Clause

-Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+Copyright (c) 2018-2021 Gavin D. Howard and contributors.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
@@ -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**
@@ -1,7 +1,7 @@
 .\"
 .\" SPDX-License-Identifier: BSD-2-Clause
 .\"
-.\" Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+.\" Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions are met:
@@ -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" "October 2020" "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].
@@ -514,6 +526,10 @@ generator with \f[B]rand()\f[R] and \f[B]irand(E)\f[R] are guaranteed to
 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
+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.
 .SS Numbers
 .PP
 Numbers are strings made up of digits, uppercase letters, and at most
@@ -560,7 +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
@@ -670,7 +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]
@@ -1116,7 +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.
@@ -1177,7 +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
@@ -1935,11 +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
@@ -1947,7 +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
@@ -2,7 +2,7 @@

 SPDX-License-Identifier: BSD-2-Clause

-Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+Copyright (c) 2018-2021 Gavin D. Howard and contributors.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
@@ -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.
@@ -399,7 +407,10 @@ generator.
 **Note**: The values returned by the pseudo-random number generator with
 **rand()** and **irand(E)** 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.
+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
+reproducible stream of pseudo-random numbers is *ESSENTIAL*. In any other case,
+use a non-seeded pseudo-random number generator.

 ## Numbers

@@ -437,7 +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

@@ -535,7 +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
@@ -866,7 +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.

@@ -918,8 +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**.
@@ -1587,17 +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**
@@ -1,7 +1,7 @@
 .\"
 .\" SPDX-License-Identifier: BSD-2-Clause
 .\"
-.\" Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+.\" Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions are met:
@@ -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" "October 2020" "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].
@@ -514,6 +526,10 @@ generator with \f[B]rand()\f[R] and \f[B]irand(E)\f[R] are guaranteed to
 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
+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.
 .SS Numbers
 .PP
 Numbers are strings made up of digits, uppercase letters, and at most
@@ -560,7 +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
@@ -670,7 +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]
@@ -1116,7 +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.
@@ -1177,7 +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
@@ -1935,11 +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
@@ -1947,7 +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
@@ -2,7 +2,7 @@

 SPDX-License-Identifier: BSD-2-Clause

-Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+Copyright (c) 2018-2021 Gavin D. Howard and contributors.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
@@ -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.
@@ -399,7 +407,10 @@ generator.
 **Note**: The values returned by the pseudo-random number generator with
 **rand()** and **irand(E)** 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.
+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
+reproducible stream of pseudo-random numbers is *ESSENTIAL*. In any other case,
+use a non-seeded pseudo-random number generator.

 ## Numbers

@@ -437,7 +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

@@ -535,7 +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
@@ -866,7 +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.

@@ -918,8 +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**.
@@ -1587,17 +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**
@@ -1,7 +1,7 @@
 .\"
 .\" SPDX-License-Identifier: BSD-2-Clause
 .\"
-.\" Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+.\" Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions are met:
@@ -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" "October 2020" "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].
@@ -509,6 +521,10 @@ generator with \f[B]rand()\f[R] and \f[B]irand(E)\f[R] are guaranteed to
 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
+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.
 .SS Numbers
 .PP
 Numbers are strings made up of digits, uppercase letters, and at most
@@ -555,7 +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
@@ -665,7 +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]
@@ -1111,7 +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.
@@ -1172,7 +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
@@ -1930,11 +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
@@ -1942,7 +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
@@ -2,7 +2,7 @@

 SPDX-License-Identifier: BSD-2-Clause

-Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+Copyright (c) 2018-2021 Gavin D. Howard and contributors.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
@@ -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.
@@ -395,7 +403,10 @@ generator.
 **Note**: The values returned by the pseudo-random number generator with
 **rand()** and **irand(E)** 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.
+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
+reproducible stream of pseudo-random numbers is *ESSENTIAL*. In any other case,
+use a non-seeded pseudo-random number generator.

 ## Numbers

@@ -433,7 +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

@@ -531,7 +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
@@ -862,7 +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.

@@ -914,8 +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**.
@@ -1583,17 +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**
@@ -1,7 +1,7 @@
 .\"
 .\" SPDX-License-Identifier: BSD-2-Clause
 .\"
-.\" Copyright (c) 2018-2020 Gavin D. Howard and contributors.
+.\" Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions are met:
@@ -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" "October 2020" "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].
@@ -509,6 +521,10 @@ generator with \f[B]rand()\f[R] and \f[B]irand(E)\f[R] are guaranteed to
 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
+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.
 .SS Numbers
 .PP
 Numbers are strings made up of digits, uppercase letters, and at most
@@ -555,7 +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
@@ -665,7 +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]
@@ -1111,7 +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.
@@ -1172,7 +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
@@ -1930,11 +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
@@ -1942,7 +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