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Kyle Evans
3f0e109209
This allows us to do things like:
```
local fp = assert(fbsd.exec({"ls", "-l"}, true))
local fpout = assert(fp:stdout())
while true do
local line = fpout:read("l")
if not line then break end
print("Read: " .. line)
end
fp:close()
```
The makeman lua rewrite will use it to capture `make showconfig` output
for processing.
Reviewed by: bapt
Differential Revision: https://reviews.freebsd.org/D50539