GNU bug report logs - #68989
grep -m[2+] > /dev/null

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Package: grep; Reported by: Grisha Levit <grishalevit@HIDDEN>; dated Thu, 8 Feb 2024 08:39:01 UTC; Maintainer for grep is bug-grep@HIDDEN.

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Date: Mon, 13 May 2024 00:27:19 -0700
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Subject: Re: bug#68989: grep -m[2+] > /dev/null
To: Grisha Levit <grishalevit@HIDDEN>
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On 2024-05-12 22:26, Grisha Levit wrote:

> Just noticed that with this patch grep has extra output when -m is used
> with -[lLq]:
> 
>      $ echo x | grep -l -m1 .
>      x
>      (standard input)
> 
>      $ echo x | grep -q -m1 .
>      x

Thanks for letting us know; I've reopened the bug report.
Information forwarded to bug-grep@HIDDEN:
bug#68989; Package grep. Full text available.
Did not alter fixed versions and reopened. Request was from Debbugs Internal Request <help-debbugs@HIDDEN> to internal_control <at> debbugs.gnu.org. Full text available.
bug unarchived. Request was from Paul Eggert <eggert@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Did not alter fixed versions and reopened. Request was from Debbugs Internal Request <help-debbugs@HIDDEN> to internal_control <at> debbugs.gnu.org. Full text available.
bug archived. Request was from Debbugs Internal Request <help-debbugs@HIDDEN> to internal_control <at> debbugs.gnu.org. Full text available.

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Subject: Re: bug#68989: grep -m[2+] > /dev/null
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Thanks for the bug report. I installed the attached patch; please give 
it a try.
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Notification sent to Grisha Levit <grishalevit@HIDDEN>:
bug acknowledged by developer. Full text available.
Reply sent to Paul Eggert <eggert@HIDDEN>:
You have taken responsibility. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: Grisha Levit <grishalevit@HIDDEN>
Date: Thu, 8 Feb 2024 03:37:24 -0500
Message-ID: <CAMu=Brrn1nUzv8pV7fYa-3GNryTXLi4p73N8ycOAZiHN4VFxYg@HIDDEN>
Subject: grep -m[2+] > /dev/null
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--0000000000003400d40610dab974
Content-Type: text/plain; charset="UTF-8"

This example file will require multiple reads:

$ printf '%07d\n' {0..98304} > txt

When limiting the match count to 1, the input offset is correctly restored
before grep exits,  no matter the output:

$ { grep -m1 . >/dev/zero; head -n1; } < txt
0000001
$ { grep -m1 . >/dev/null; head -n1; } < txt
0000001

If the count is 2 or higher, this also works, unless the output is being
discarded to /dev/null -- in this case not only is the input offset not
restored, but the entire file is consumed:

$ { grep -m2 . >/dev/zero; head -n1; } < txt
0000002
$ { grep -m2 . >/dev/null; head -n1; } < txt
$

--0000000000003400d40610dab974
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto"><div dir=3D"auto">This example file will require multiple=
 reads:</div><div dir=3D"auto"><br></div>$ printf &#39;%07d\n&#39; {0..9830=
4} &gt; txt<div dir=3D"auto"><br></div><div dir=3D"auto">When limiting the =
match count to 1, the input offset is correctly restored before grep exits,=
=C2=A0 no matter the output:</div><div dir=3D"auto"><br></div><div dir=3D"a=
uto"><div dir=3D"auto">$ { grep -m1 . &gt;/dev/zero; head -n1; } &lt; txt</=
div><div dir=3D"auto">0000001</div><div dir=3D"auto">$ { grep -m1 . &gt;/de=
v/null; head -n1; } &lt; txt</div><div dir=3D"auto">0000001</div><div dir=
=3D"auto"><br></div><div dir=3D"auto">If the count is 2 or higher, this als=
o works, unless the output is being discarded to /dev/null -- in this case =
not only is the input offset not restored, but the entire file is consumed:=
</div><div dir=3D"auto"><br></div><div dir=3D"auto">$ { grep -m2 . &gt;/dev=
/zero; head -n1; } &lt; txt</div><div dir=3D"auto">0000002</div><div dir=3D=
"auto">$ { grep -m2 . &gt;/dev/null; head -n1; } &lt; txt</div><div dir=3D"=
auto">$</div><div dir=3D"auto"><br></div><div dir=3D"auto"><br></div></div>=
</div>

--0000000000003400d40610dab974--
Acknowledgement sent to Grisha Levit <grishalevit@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-grep@HIDDEN. Full text available.
Report forwarded to bug-grep@HIDDEN:
bug#68989; Package grep. Full text available.
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