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[debbugs-tracker] bug#26254: closed (grep's -m breaks -A)

From: GNU bug Tracking System
Subject: [debbugs-tracker] bug#26254: closed (grep's -m breaks -A)
Date: Thu, 22 Jun 2017 02:02:02 +0000

Your message dated Wed, 21 Jun 2017 19:01:41 -0700
with message-id <address@hidden>
and subject line Re: bug#26254: grep's -m breaks -A
has caused the debbugs.gnu.org bug report #26254,
regarding grep's -m breaks -A
to be marked as done.

(If you believe you have received this mail in error, please contact

26254: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=26254
GNU Bug Tracking System
Contact address@hidden with problems
--- Begin Message --- Subject: Re: grep's -m breaks -A Date: Sat, 25 Mar 2017 09:23:31 -0700
On Sat, Mar 25, 2017 at 12:12 AM, Stuart MacDonald
<address@hidden> wrote:
> Follow-up Comment #3, bug #28588 (project grep):
> I just ran into this, trying to grep for the start of a problem in a 60 Gb
> syslog. :-(
> Context must always be printed; the current behaviour is unexpected,
> surprising, and counter-intuitive, says the lifetime unified diff user.

Please keep the discussion on the mailing list, not on that obsolete
tracker. I've added our bug-grep@ address, so this thread will
automatically get a new bug number in the debbugs-based tracker.

I responded to the OP back in 2010:


Repeating part of that here, this behavior is documented, and now tested:

    `-m NUM'
         Stop reading a file after NUM matching lines.  If the input is
         standard input from a regular file, and NUM matching lines are
         output, `grep' ensures that the standard input is positioned just
         after the last matching line before exiting, regardless of the
         presence of trailing context lines.  This enables a calling
         process to resume a search.  For example, the following shell
         script makes use of it:

              while grep -m 1 PATTERN
                echo xxxx
              done < FILE

Notice how it says grep takes care to position the standard input that
only the specified maximum number of matches are "read". This means
*not* printing all of the requested trailing context when that context
would contain any additional match.

--- End Message ---
--- Begin Message --- Subject: Re: bug#26254: grep's -m breaks -A Date: Wed, 21 Jun 2017 19:01:41 -0700 User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.0
On 06/21/2017 06:27 PM, Jim Meyering wrote:
Thanks for all of that careful work. It looks fine to me.
Please add a reference to this bug number, 26254, in the commit log.

Thanks, done.

--- End Message ---

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