Hi, here is my modified code, i want to place the comment(#) start of that line my input file consist this data eg: testing is requrired see/for/test test/data/istesting my output should be testing is requrired #see/for/test #test/data/istesting But what ever iam trying it is not working, can you help

#!/usr/bin/perl -w
use strict;
use warnings;
my $line = 0;
my $file_name = "test.txt";
open(my $fh, '<', $file_name) || die "file could not open $! \n";
while( $line = <$fh>) {
        if( $line =~ s/\btest\b/^\#/ig ) {
                print  "$line\n";
        }
}
close($fh);
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