:g/re/p

agrep est mort mais tre-agrep le remplace avantageusement.

sudo apt-get install tre-agrep

source: http://www.sun.com/bigadmin/scripts/submittedScripts/cgrep.txt

### Copyright 2008 Sun Microsystems, Inc. ALL RIGHTS RESERVED

### Use of this software is authorized pursuant to the

### terms of the license found at

### http://www.sun.com/bigadmin/common/berkeley_license.html

#!/usr/bin/perl -w

use Getopt::Long;

# defaults
$before = -1;
@BEFORE = ();
$after = -1;
$remaining = 0;
$context = 1;
$search = "";
$params = "";
$insensitive = 0;
$vt100 = 1;
$bold = "\x1b[1m";
$normal = "\x1b[0m";
$help = 0;
$return = 1;
$line = "--\n";
$separator = 0;

sub help {
    $usage = <<EOF;
usage: $0 [options] search-regexp [files]
cgrep acts like grep to search for regular expressions in specified files
and display matched lines.

Although it does not have all the features of standard Solaris grep, it has
one feature no available in the stock version - it can display lines occuring
before and after the matched line to provide context.

If no files are specified, the program reads from standard input.

Options:
\t[-b NUM, --before NUM] print NUM lines from file before matched line
\t[-a NUM, --after NUM] print NUM lines from file after matched line
\t[-c NUM, --context NUM] print NUM lines from file before and after matched line
\t defaults to 1
\t[-i, --[no]insensitive] case-insensitive (or sensitive) search
\t defaults to case-sensitive
\t[-v, -nov, --[no]vt100] highlight (or not) matched lines with vt100 sequences
\t defaults to highlighting
\t[-s, --[no]separator] put separator between matched lines and context
\t defaults to no separator
\t[-h, --help] print this message
EOF

    print "$usage\n";
    exit 2;
}

%options = (
	 "before" => \$before,
	 "after" => \$after,
	 "context" => \$context,
	 "insensitive" => \$insensitive,
	 "vt100" => \$vt100,
	 "separator" => \$separator,
	 "help" => \$help
);

GetOptions(\%options,
	   "before=i",
	   "after=i",
	   "context=i",
	   "insensitive!",
	   "vt100!",
	   "separator!",
	   "help!"
	   );

help if ($help);

die "No search regular expression entered.\n" if ($#ARGV < 0);

$before = $context if ($before == -1);
$after = $context if ($after == -1);

$bold = "" if not $vt100;
$normal = "" if not $vt100;

$line = "" if not $separator;

$params .= "i" if ($insensitive);
$search = shift(@ARGV);

$test="/$search/o$params";

while (<>) {
    shift (@BEFORE) if ($#BEFORE == $before);
    if (eval($test)) {
	$return = 0;
	print $line, @BEFORE;
	print "$bold$_$normal";
	@BEFORE = ();
	$remaining = $after;
    } elsif ($remaining > 0) {
	$remaining--;
	print;
    } else {
	push (@BEFORE, $_) if ($before > 0);
    }
}

exit $return;


##############################################################################
### This script is submitted to BigAdmin by a user of the BigAdmin community.
### Sun Microsystems, Inc. is not responsible for the
### contents or the code enclosed. 
###
###
### Copyright 2008 Sun Microsystems, Inc. ALL RIGHTS RESERVED
### Use of this software is authorized pursuant to the
### terms of the license found at
### http://www.sun.com/bigadmin/common/berkeley_license.html
##############################################################################

ex.: massacres.sh

rm massacres.txt
cat massacres  | while read i
do
 echo $i >> massacres.txt
 cgrep -i massacre $i >> massacres.txt
 echo "-----------------"  >> massacres.txt
 #echo $i
 #cgrep -c 3 -i massacre $i | more
 #echo "-----------------"
done