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Date: Mon, 4 Apr 2011 15:28:48 -0700
Message-ID: <BANLkTi=dk+30p2JizsGgH0bGDc5nQaMkkw@mail.gmail.com>
From: Garrett Cooper <yanegomi@gmail.com>
To: rank1seeker@gmail.com
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Cc: freebsd-hackers@freebsd.org
Subject: Re: Extending sed's exit codes functionality
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On Mon, Apr 4, 2011 at 9:25 AM,  <rank1seeker@gmail.com> wrote:
> http://forums.freebsd.org/showthread.php?p=129996

    gordon@'s observation seems valid:
http://forums.freebsd.org/showpost.php?p=130007&postcount=2 ?
    Your other question about grep returning 141 was because it caught
SIGPIPE, so probably a *csh bug (I wouldn't be surprised).
    When in doubt, simplify (and don't use csh)!

$ csh -c "cat /sys/conf/NOTES | grep -m 1 '^device' /sys/conf/NOTES; echo \$?"
device          hwpmc                   # Driver (also a loadable module)
141
$ env ENV=/dev/null sh -c "cat /sys/conf/NOTES | grep -m 1 '^device'
/sys/conf/NOTES; echo \$?"
device          hwpmc                   # Driver (also a loadable module)
0

    You might want to ktrace/truss the piped process to figure out why
it's catching SIGPIPE, and maybe submit a bug report once you figure
out why csh isn't playing nicely.
    Happy hunting.
Thanks,
-Garrett