#!/usr/bin/perl -w open(IN1, "file1.txt"); open(IN2, "file2.txt"); $counter = 1; while() { $phone2 = substr($_, 0, 10); print "Match: 0" . "\r"; while() { $phone1 = substr($_, 1384, 10); if($phone1 == $phone2) { print "Match: " . $counter . "\r"; $counter++; } } } print "\n"; close(IN1); close(IN2);