GNU bug report logs - #30242
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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eric Blake <eblake <at> redhat.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#30242: closed (help)
Date: Wed, 24 Jan 2018 22:23:03 +0000

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Your message dated Wed, 24 Jan 2018 16:22:32 -0600
with message-id <613467d7-d329-5c0b-a500-e9cb501d9f1b <at> redhat.com>
and subject line Re: bug#30242: help
has caused the debbugs.gnu.org bug report #30242,
regarding help
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
30242: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=30242
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Masoudi <hassan_masoudi2000 <at> yahoo.com>
To: "bug-grep <at> gnu.org" <bug-grep <at> gnu.org>
Subject: help
Date: Wed, 24 Jan 2018 20:51:49 +0000 (UTC)

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Hii want to copy some data from a file by using of grep...grep -n A HISTORY > outbut the desired information is not the line of A, and i need information located at the next line ( below line of A)
A  1   2   3
23   34  55
i mean i need the line 23 34 55.would you mind to help me please?many thanks

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From: Eric Blake <eblake <at> redhat.com>
To: Masoudi <hassan_masoudi2000 <at> yahoo.com>, 30242-done <at> debbugs.gnu.org,
 GNU bug control <control <at> debbugs.gnu.org>
Subject: Re: bug#30242: help
Date: Wed, 24 Jan 2018 16:22:32 -0600

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tag 30242 notabug
thanks

On 01/24/2018 02:51 PM, Masoudi wrote:
> Hii want to copy some data from a file by using of grep...grep -n A HISTORY > outbut the desired information is not the line of A, and i need information located at the next line ( below line of A)
> A  1   2   3
> 23   34  55
> i mean i need the line 23 34 55.would you mind to help me please?many thanks

(Your email engine botched the formatting of your mail as rendered in
plain text; technical lists tend to frown on html mail as unnecessary
overhead and lousy rendering)

grep already supports this: use 'grep -A1 "$pattern"' to output a line
that matches and the line immediately following the match.  If you
further want ONLY the line after, you can do things like:

grep -n -A1 "$patt" | sed -n 's/^[1-9][0-9]*-//p'

which uses the decorate-act-undecorate paradigm (grep -n decorates
matches with 'line:' and followups with 'line-'; the sed then picks the
followups and removes the decorations).

As -A is already documented as a grep option, I'm closing this as not a
bug in the database.  However, feel free to followup with further
questions on the topic.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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