[Israel.pm] context grep in Perl

Levenglick Dov-RM07994 RM07994 at freescale.com
Mon Nov 28 07:16:07 PST 2011

Show off :)

Best Regards,
Dov Levenglick
SmartDSP OS Development Leader
From: perl-bounces at perl.org.il [mailto:perl-bounces at perl.org.il] On Behalf Of Gaal Yahas
Sent: Monday, November 28, 2011 15:03
To: Perl in Israel
Subject: Re: [Israel.pm] context grep in Perl

Sorry, the match should be $_ =~  /$pat/o, and not against $c, to reduce dupes.
On Mon, Nov 28, 2011 at 3:01 PM, Gaal Yahas <gaal at forum2.org> wrote:
perl -nle 'BEGIN {$pat = shift @ARGV} push @c, $_; shift @c if @c > 3; $c = join "\n", @c; print "$c\n----\n" if $c =~ /$pat/o'

  <one-liner> REGEXP FILE ...

This hardcodes 3 as the context value, if you want better options (for example, if you want to use substrings intsead of regexps for matching, -v, etc.) you probably need more than a single line.
On Mon, Nov 28, 2011 at 2:28 PM, Yossi Itzkovich <Yossi.Itzkovich at ecitele.com> wrote:
In this link : http://docstore.mik.ua/orelly/unix/upt/ch27_13.htm
They mention cgrep that is implemented in Perl.
Does someone have such implementation ?
Is there a one-liner  ("real" one liner) solution ?
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Gaal Yahas <gaal at forum2.org>

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