GNU bug report logs - #28304
Feature Request - Quit on Non Match

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Package: grep; Severity: wishlist; Reported by: Adam Danischewski <adam.danischewski@HIDDEN>; dated Thu, 31 Aug 2017 14:44:02 UTC; Maintainer for grep is bug-grep@HIDDEN.

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 <201708311453.v7VErUtT024120@HIDDEN>
From: Adam Danischewski <adam.danischewski@HIDDEN>
Date: Thu, 31 Aug 2017 13:50:49 -0400
Message-ID: <CAOQZJ0GMpE9o8aszYH6R31AYAcAd9Hn3UB2mVidDQ=uNcbHs5Q@HIDDEN>
Subject: Re: bug#28304: Feature Request - Quit on Non Match
To: arnold@HIDDEN
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Yes, awk can handle it except for maybe very large files. I was trying to
keep it restricted to grep, grep is already counting matches with -m but
maybe GNU views this direction as becoming too programmatic from what the
original vision of grep is?

awk '{if($0~/^[ \t\f#]+/)print $0;else exit}' gen_ent.bsh

Thanks anyway,
 +AMD

On Thu, Aug 31, 2017 at 10:53 AM, <arnold@HIDDEN> wrote:

> Adam Danischewski <adam.danischewski@HIDDEN> wrote:
>
> > I've been writing parsers and it would be really nice if grep could do
> the
> > following:
> >
> > *grep --quit-nm 1 -Pno "^[ \t\f]*#.*$" <(sed -n '2,$p' gen_ent.bsh)*
> >
> > If you:
> > *grep -m 1 -Pno "^[ \t\f]*#.*$" <(sed -n '2,$p' gen_ent.bsh)*
> >
> > Only the first match of the header block gets printed, yet it would be
> nice
> > if grep in O(n), could simply be on the look out for the first failure to
> > match the -o context and quit at --quit-nm non-match occurrences.
>
> I may be misunderstanding what you want, but something like
>
>         awk '/pattern to match/ { print ; continue }
>                 { exit 0}' file
>
> might do what I think you want - exit on first non match.
>
> If gawk can do the same matching you're doing with grep -Pno, that
> is a different question.
>
> HTH,
>
> Arnold
>

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<div dir=3D"ltr"><div><div>Yes, awk can handle it except for maybe very lar=
ge files. I was trying to keep it restricted to grep, grep is already count=
ing matches with -m but maybe GNU views this direction as becoming too prog=
rammatic from what the original vision of grep is? <br><br>awk &#39;{if($0~=
/^[ \t\f#]+/)print $0;else exit}&#39; gen_ent.bsh<br><br></div>Thanks anywa=
y, <br></div>=C2=A0+AMD <br></div><div class=3D"gmail_extra"><br><div class=
=3D"gmail_quote">On Thu, Aug 31, 2017 at 10:53 AM,  <span dir=3D"ltr">&lt;<=
a href=3D"mailto:arnold@HIDDEN" target=3D"_blank">arnold@HIDDEN</a>=
&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0=
 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Adam Danischewski &lt;=
<a href=3D"mailto:adam.danischewski@HIDDEN">adam.danischewski@HIDDEN<=
/a>&gt; wrote:<br>
<br>
&gt; I&#39;ve been writing parsers and it would be really nice if grep coul=
d do the<br>
&gt; following:<br>
&gt;<br>
&gt; *grep --quit-nm 1 -Pno &quot;^[ \t\f]*#.*$&quot; &lt;(sed -n &#39;2,$p=
&#39; gen_ent.bsh)*<br>
&gt;<br>
&gt; If you:<br>
&gt; *grep -m 1 -Pno &quot;^[ \t\f]*#.*$&quot; &lt;(sed -n &#39;2,$p&#39; g=
en_ent.bsh)*<br>
&gt;<br>
&gt; Only the first match of the header block gets printed, yet it would be=
 nice<br>
&gt; if grep in O(n), could simply be on the look out for the first failure=
 to<br>
&gt; match the -o context and quit at --quit-nm non-match occurrences.<br>
<br>
I may be misunderstanding what you want, but something like<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 awk &#39;/pattern to match/ { print ; continue =
}<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 { exit 0}&#39; file=
<br>
<br>
might do what I think you want - exit on first non match.<br>
<br>
If gawk can do the same matching you&#39;re doing with grep -Pno, that<br>
is a different question.<br>
<br>
HTH,<br>
<br>
Arnold<br>
</blockquote></div><br></div>

--001a11482d10f5d9be05581048cd--
Information forwarded to bug-grep@HIDDEN:
bug#28304; Package grep. Full text available.

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Subject: Re: bug#28304: Feature Request - Quit on Non Match
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Adam Danischewski <adam.danischewski@HIDDEN> wrote:

> I've been writing parsers and it would be really nice if grep could do the
> following:
>
> *grep --quit-nm 1 -Pno "^[ \t\f]*#.*$" <(sed -n '2,$p' gen_ent.bsh)*
>
> If you:
> *grep -m 1 -Pno "^[ \t\f]*#.*$" <(sed -n '2,$p' gen_ent.bsh)*
>
> Only the first match of the header block gets printed, yet it would be nice
> if grep in O(n), could simply be on the look out for the first failure to
> match the -o context and quit at --quit-nm non-match occurrences.

I may be misunderstanding what you want, but something like

	awk '/pattern to match/ { print ; continue }
		{ exit 0}' file

might do what I think you want - exit on first non match.

If gawk can do the same matching you're doing with grep -Pno, that
is a different question.

HTH,

Arnold
Information forwarded to bug-grep@HIDDEN:
bug#28304; Package grep. Full text available.

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Subject: Feature Request - Quit on Non Match
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--001a113d638c0287e705580dabed
Content-Type: text/plain; charset="UTF-8"

I've been writing parsers and it would be really nice if grep could do the
following:

*grep --quit-nm 1 -Pno "^[ \t\f]*#.*$" <(sed -n '2,$p' gen_ent.bsh)*

If you:
*grep -m 1 -Pno "^[ \t\f]*#.*$" <(sed -n '2,$p' gen_ent.bsh)*

Only the first match of the header block gets printed, yet it would be nice
if grep in O(n), could simply be on the look out for the first failure to
match the -o context and quit at --quit-nm non-match occurrences.

--001a113d638c0287e705580dabed
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div><div><div>I&#39;ve been writing parsers and it would =
be really nice if grep could do the following: <br></div><div>=C2=A0<br></d=
iv><b>grep --quit-nm 1 -Pno &quot;^[ \t\f]*#.*$&quot; &lt;(sed -n &#39;2,$p=
&#39; gen_ent.bsh)</b><br><br></div>If you: <br><b>grep -m 1 -Pno &quot;^[ =
\t\f]*#.*$&quot; &lt;(sed -n &#39;2,$p&#39; gen_ent.bsh)</b><br><br></div>O=
nly the first match of the header block gets printed, yet it would be nice =
if grep in O(n), could simply be on the look out for the first failure to m=
atch the -o context and quit at --quit-nm non-match occurrences. <br><br></=
div>

--001a113d638c0287e705580dabed--
Acknowledgement sent to Adam Danischewski <adam.danischewski@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-grep@HIDDEN. Full text available.
Report forwarded to bug-grep@HIDDEN:
bug#28304; Package grep. Full text available.
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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.