thanks iam going to check this module ..
i think you saw the code that posted before your post

#!/usr/bin/perl -w

use strict;

print " please enter the domain name: ";

my $targetdomain = <STDIN>;

chomp $targetdomain;

my $file = "/home/blackice/hello";

open HAN,$file || die "error opening file: $!";

my $comment = 0;
my $block = 0;
while (<HAN>) {
/^zone\s+"$targetdomain"/ and $comment++;
if($comment) {
$block += () = /(\{)/g; # add the number of { matches to $block
s!^!// ! if $comment && $block;
$block -= () = /(\})/g; # substract the number of } matches
$comment = 0 unless $block;
}
print;
}
[download]

and my question is how i can make the effects appear in file by commenting the lines without printing it to shell .