GNU bug report logs - #16723
Bug using -A and -v at least in 2.14 of grep !?

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

From: "NICOLAI, Volker (AKKA IS)" <volker.nicolai.external <at> airbus.com>
To: "bug-grep <at> gnu.org" <bug-grep <at> gnu.org>
Subject: Bug using -A and -v at least in 2.14 of grep !?
Date: Tue, 11 Feb 2014 15:13:12 +0100

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

Hi,
I tried to filter 3 repeating lines out of XML file. The first line contains "stylesheet".
The command I used is: grep -v -A 2 stylesheet FILENAME
The search without the -v works filtering out the 3 expected lines but the above command line does not work.
I would call that a bug - you too?
Looked into you reported bug, nothing there so I suspect 2.16. still hasn't changed here and I save my time triying.
Regards
Volker


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Message #12 received at 16723-done <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: 16723-done <at> debbugs.gnu.org
Subject: Re:  Bug using -A and -v at least in 2.14 of grep !?
Date: Sat, 08 Mar 2014 15:13:13 -0800

Sorry, I don't see a bug here.  grep -v PAT matches all lines that do 
not match PAT.  If a line doesn't contain the word 'stylesheet', 'grep 
-v stylesheet' will match the line even if it is adjacent to a line that 
does contain 'stylesheet', and -A 2 will then print the adjacent line.

Message #15 received at 16723 <at> debbugs.gnu.org (full text, mbox):

From: "NICOLAI, Volker (AKKA IS)" <volker.nicolai.external <at> airbus.com>
To: "16723 <at> debbugs.gnu.org" <16723 <at> debbugs.gnu.org>
Subject: AW: bug#16723: closed (Re:  Bug using -A and -v at least in 2.14 of
 grep !?)
Date: Mon, 10 Mar 2014 08:11:00 +0100

I agree, Paul, we could argue on what is the right behavior, but to make it clearer (because I might have been a bit misleading in my initial mail):
I want to get rid of the lines containing "stylesheet" and the two lines following that line because they belong together!
So
	grep -v -A 2 stylesheet FILENAME > NEWFILE
shall give me that new file without the "stylesheet" parts! 
That means the -A has to change behavior when using -v (-A sort of belongs to the -v then)!

The actual behavior you describe, Paul, is one that you probably only very rarely need - I reckon.
Regards
Volker


-----Ursprüngliche Nachricht-----
Von: GNU bug Tracking System [mailto:help-debbugs <at> gnu.org] 
Gesendet: Sonntag, 9. März 2014 00:14
An: NICOLAI, Volker (AKKA IS)
Betreff: bug#16723: closed (Re: Bug using -A and -v at least in 2.14 of grep !?)

Your bug report

#16723: Bug using -A and -v at least in 2.14 of grep !?

which was filed against the grep package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 16723 <at> debbugs.gnu.org.

-- 
16723: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=16723
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Message #18 received at 16723 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: "NICOLAI, Volker (AKKA IS)" <volker.nicolai.external <at> airbus.com>, 
 "16723 <at> debbugs.gnu.org" <16723 <at> debbugs.gnu.org>
Subject: Re: bug#16723: AW: bug#16723: closed (Re: Bug using -A and -v at
 least in 2.14 of grep !?)
Date: Mon, 10 Mar 2014 00:42:25 -0700

NICOLAI, Volker (AKKA IS) wrote:
> I want to get rid of the lines containing "stylesheet" and the two lines following that line because they belong together!

I see now, but that's not what grep does.  It'd be easy to write an Awk 
script to do what you want, and I suggest doing that.

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