GNU bug report logs - #39591
grep v3.4 after-context

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

From: "Adams, John" <john.adams <at> anritsu.com>
To: "bug-grep <at> gnu.org" <bug-grep <at> gnu.org>
Subject: grep v3.4 after-context
Date: 2020年2月13日 16:49:17 +0000

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Recent greps do not behave as documented with respect to after-context. In the past I've been accustomed to -AX meaning print X lines of after context. That is not how gnu grep is working now, but it is how it is documented. In fact -AX, which I tested with a v3.4 that I build on Ubuntu 18, will print X+1 lines of after-context. If you want 1, you must say -A0.

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Message #8 received at 39591 <at> debbugs.gnu.org (full text, mbox):

From: Jim Meyering <jim <at> meyering.net>
To: "Adams, John" <john.adams <at> anritsu.com>
Cc: 39591 <at> debbugs.gnu.org
Subject: Re: bug#39591: grep v3.4 after-context
Date: 2020年2月21日 19:08:16 -0800

tags 39591 + moreinfo
stop
On Thu, Feb 13, 2020 at 8:58 AM Adams, John <john.adams <at> anritsu.com> wrote:
> Recent greps do not behave as documented with respect to after-context. In the past I've been accustomed to -AX meaning print X lines of after context. That is not how gnu grep is working now, but it is how it is documented. In fact -AX, which I tested with a v3.4 that I build on Ubuntu 18, will print X+1 lines of after-context. If you want 1, you must say -A0.
Thanks for the report. Can you provide a stand-alone example like the
following to demonstrate the problem?
I am unable to reproduce it so far, since this prints only one line of
following context:
$ printf '%s\n' a b c d e | grep -A1 c
c
d

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