GNU bug report logs - #37716
grep exit status with -L redirected to /dev/null

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Adam Sampson <ats <at> offog.org>
To: bug-grep <at> gnu.org
Subject: grep exit status with -L redirected to /dev/null
Date: Sat, 12 Oct 2019 15:22:05 +0100

Hi grep maintainers,

This behaviour, with grep 3.3 built from source, is a bit surprising:

$ echo hello >thing
$ grep -L goodbye thing && echo OK
thing
OK
$ grep -L goodbye thing >/dev/null && echo OK
$

That is, when using -L, redirecting stdout to /dev/null has the same
effect on the exit code as specifying -q (the behaviour with -q is
described in the "Exit Status" section of the manual). This is a bit
awkward if you're using grep in a script, because you don't necessarily
have any control over whether stdout is /dev/null or not.

Cheers,

-- 
Adam Sampson <ats <at> offog.org>                         <http://offog.org/>

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