On Tue Aug 2, 2022 at 5:55 AM EDT, Alejandro Colomar wrote:
The thing is that I'm running mandoc(1) from a Makefile, which means
that not only stdout/stderr is important, but also the exit status.
There's no trivial way to ignore mandoc(1)'s error code for certain
warnings. Also, I run it for a few thousands of manual pages, so I
don't want make(1) to stop at every page that triggers an unwanted
warning. But I do want make(1) to stop at errors/warnings in general.
You could swap mandoc’s stderr and stdout, then filter it with sed and
redirect sed to stderr:
mandoc -W <level> 3>&2 2>&1 1>&3 | sed '/reg/ex/d' >&2
Of course if mandoc also normally writes to stdout this would create new
stuff on stderr, so you could run it in two-passes:
# pass where we care about mandoc’s regular output
mandoc 2>/dev/null
# pass where we care about mandoc’s errors
mandoc -W <level> 2>&1 >/dev/null | sed '/reg/ex/d' >&2
(https://stackoverflow.com/questions/13299317/)
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