GNU bug report logs - #30550
zgrep over multiple files returns 1 if pattern not found in a single file even if found in other files

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

From: David McCauley <mccauley.david <at> ymail.com>
To: "bug-grep <at> gnu.org" <bug-grep <at> gnu.org>, 
 "charles <at> comm.polymtl.ca" <charles <at> comm.polymtl.ca>
Subject: zgrep over multiple files returns 1 if pattern not found in a
 single file even if found in other files
Date: Tue, 20 Feb 2018 15:01:05 +0000 (UTC)

[Message part 1 (text/plain, inline)]

grep version: 2.20zgrep version: 1.5

$cat test1hello
$cat test2goodbye
$cat test3goodbye
$cat test4goodbye
$grep "hello" test1     #works as expected
hello$echo $?0
$grep "goodbye" test1     #works as expected$echo $?1
$grep "hello" *    #works as expected. gets line from test1 and returns 0test1:hello$echo $?0
$grep "goodbye" *    #works as expected. gets lines from test2, 3, and 4 and returns 0test2:goodbyetest3:goodbyetest4:goodbye$echo $?0

despite stating zgrep works the same as grep, the return codes over multiple files are different
$zgrep "hello" test1     #works as expected
hello$echo $?0
$zgrep "goodbye" test1     #works as expected$echo $?1
$zgrep "hello" *    #does NOT work as expected. gets line from test1 and returns 1. grep states that if ANY line is found, 0 will be returned
test1:hello$echo $?1

$zgrep "goodbye" *    #does NOT work as expected. gets lines from test2, 3, and 4 and returns 1. grep states that if ANY line is found, 0 will be returned
test2:goodbyetest3:goodbyetest4:goodbye$echo $?1

$zgrep "goodbye" test2 test3 test4    #works as expected. finds pattern in all files and returns 0. bug only occurs if files exist where the pattern is not foundtest2:goodbyetest3:goodbyetest4:goodbye$echo $?0

[Message part 2 (text/html, inline)]

Message #10 received at 30550-done <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: David McCauley <mccauley.david <at> ymail.com>, 30550-done <at> debbugs.gnu.org,
 charles <at> comm.polymtl.ca
Subject: Re: bug#30550: zgrep over multiple files returns 1 if pattern not
 found in a single file even if found in other files
Date: Wed, 21 Feb 2018 11:31:47 -0800

On 02/20/2018 07:01 AM, David McCauley wrote:
> zgrep version: 1.5

That's pretty old. The bug should be fixed in the current zgrep version 
(1.9). See:

https://bugs.gnu.org/17760

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