GNU bug report logs - #31537
Combining -v and -A/-B/-C options

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

From: "Garreau,円 Alexandre" <galex-713 <at> galex-713.eu>
To: bug-grep <at> gnu.org
Subject: Combining -v and -A/-B/-C options
Date: 2018年5月20日 03:15:43 +0200

[Message part 1 (text/plain, inline)]

It seems using a context option (-A (after-), -B (before-) or -C
(context)) when -v (invert-match) is in use just do nothing as well as
disabling the later. I don’t see the utility of this behavior, as well
as I didn’t see it documented anywhere in the description of any of
these options.
I believe context options used in conjonction with invert-match option
should specify which lines *not to show* along with matched then not
shown lines.
For instance, while this command:

[without-2.sh (text/x-sh, inline)]

seq 1 100 | grep -v '2$'

[Message part 3 (text/plain, inline)]

does show the list of numbers going from 1 to 100, without those ending
with "2" in base 10, this one:

[without-2-and-3.sh (text/x-sh, inline)]

seq 1 100 | grep -v '2$' -A 1

[Message part 5 (text/plain, inline)]

should also hide the lines ending with "3" because they systematically
follow those ending with "2" (currently it just show all the numbers
from 1 to 100).
I didn’t look at if grep does act differently according the order
options are given, but if so maybe this behavior could be triggered only
if the context option were specified *after* the invert-match one?
Thank you for any attention!

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