#!/usr/bin/perl open FH, "master.cfg" or die $!; open FH1, "config1.cfg" or die $!; while(my $line=){ chomp; my %hash; (my $key,my $value) = split /=/, $line; $hash{$key} = $value; while(my $line2=){ chomp; my %hash1; (my $key1,my $value1) = split /=/, $line; $hash1{$key} = $value; open FH1, ">config1_new.cfg" or die $!; if ($value1 != $value)