[debbugs-tracker] bug#24024: closed (grep: Mixing "max-count" and "after-context" outputs too few lines)

[GNU bug Tracking System]

Your message dated Wed, 7 Sep 2016 22:25:03 -0700
with message-id <address@hidden>
and subject line Re: bug#24024: grep: Mixing "max-count" and "after-context" 
outputs too few lines
has caused the debbugs.gnu.org bug report #24024,
regarding grep: Mixing "max-count" and "after-context" outputs too few lines
to be marked as done.

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24024: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=24024
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> --- Begin Message ---
>
>
>
> Subject: 
>
> grep: Mixing "max-count" and "after-context" outputs too few lines
>
>
>
>
> Date: 
>
> Tue, 19 Jul 2016 13:53:45 +0200
>
>
>
>
> Hi,
>
> Igor Bogomazov <address@hidden> filed the following bug against grep in
> Debian.
>
> El 18/07/16 a las 14:30, Igor Bogomazov escribió:
> > Package: grep
> > Version: 2.25-6
> > Severity: normal
> > 
> > 
> > Given after-context=3 it is expected to output at least 4 lines
> > as documented, but adding max-count=1 makes it stop on the next
> > matching line.
> > 
> > What I do:
> > 
> > $ printf '%s\n' a b a c | grep -m1 -A3 a
> > 
> > What I see:
> > 
> > a
> > b
> > 
> > What I expect:
> > 
> > a
> > b
> > a
> > c
> > 
> > -- System Information:
> > Debian Release: stretch/sid
> >   APT prefers unstable
> >   APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable')
> > Architecture: amd64 (x86_64)
> > 
> > Kernel: Linux 4.6.0-1-amd64 (SMP w/4 CPU cores)
> > Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
> > Shell: /bin/sh linked to /bin/dash
> > Init: systemd (via /run/systemd/system)
> > 
> > Versions of packages grep depends on:
> > ii  dpkg          1.18.9
> > ii  install-info  6.1.0.dfsg.1-8
> > ii  libc6         2.23-1
> > ii  libpcre3      2:8.38-3.1
> > 
> > grep recommends no packages.
> > 
> > Versions of packages grep suggests:
> > ii  libpcre3  2:8.38-3.1
> > 
> > -- no debconf information
> > 
>
> Note also the behavior when there is not a second match:
>
> % printf '%s\n' a b d c | grep -m1 -A3 a
> a
> b
> d
> c
>
> Cheers,
>
> Santiago
>
>
>
> --- End Message ---

--- Begin Message --- Subject: Re: bug#24024: grep: Mixing "max-count" and "after-context" outputs too few lines Date: Wed, 7 Sep 2016 22:25:03 -0700 User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

Given after-context=3 it is expected to output at least 4 lines
as documented, but adding max-count=1 makes it stop on the next
matching line.

Thanks for reporting this. Although grep's behavior is documented ("context does not include matching lines" in the node General Output Control) the documentation could be clearer and I installed the attached patch.

0001-doc-define-context-lines.txt
Description: Text document

--- End Message ---