GNU bug report logs - #30105
Additional "grep" parameter to change the exit code from 1 to 0, even if grep doesn't find pattern

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#30105: closed (Additional "grep" parameter to change the exit
 code from 1 to 0,  even if grep doesn't find pattern)
Date: Sun, 14 Jan 2018 17:17:01 +0000

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Your message dated Sun, 14 Jan 2018 09:16:41 -0800
with message-id <3d675cb6-c27c-28ad-c797-b4cd23376c1f <at> cs.ucla.edu>
and subject line Re: bug#30105: Additional "grep" parameter to change the exit code from 1 to 0, even if grep doesn't find pattern
has caused the debbugs.gnu.org bug report #30105,
regarding Additional "grep" parameter to change the exit code from 1 to 0,  even if grep doesn't find pattern
to be marked as done.

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help-debbugs <at> gnu.org.)


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From: Vasyl Vavrychuk <vvavrychuk <at> gmail.com>
To: bug-grep <at> gnu.org
Subject: Re: Additional "grep" parameter to change the exit code from 1 to 0, 
 even if grep doesn't find pattern
Date: Sun, 14 Jan 2018 07:21:11 +0200

> > I want to suggest my idea about a additional "grep" parameter which
> > would change the exit code 1 to 0, even when "grep" doesn't find a
> > pattern. I.e. something similar to "-0".
>
> Thanks, but you can avoid triggering your trap
> by appending "|| :" to your grep command.
>
> E.g.,
>
>     grep not-found /dev/null || :
>
> Then, even when grep fails, the shell sees only the successful
> exit code from the ":" (always succeeding) built-in command.

It replaces exit status 2 with success too.
I would like to have an option to return success if nothing is found but
still return fail if error happens.

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Vasyl Vavrychuk <vvavrychuk <at> gmail.com>
Cc: 30105-done <at> debbugs.gnu.org
Subject: Re: bug#30105: Additional "grep" parameter to change the exit code
 from 1 to 0, even if grep doesn't find pattern
Date: Sun, 14 Jan 2018 09:16:41 -0800

Vasyl Vavrychuk wrote:
> Actually I use grep in pipe with
> 
>    set -eo pipefail
> 
> but still there I can do
> 
>    ... | grep exrp || test $? -lt 2 | ...
> 
> Thanks for suggestion.

You're welcome. You'll need to parenthesize of course. Closing the bug.

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