#!/usr/bin/perl

use strict;
use warnings;

my $lines = 0;
my $filename = '/path/to/ImageMagick.tar.gz';
die "Can't open '${filename}': $!" unless open(FILE, '<', $filename);
while (sysread FILE, my $buffer, 4096) {
               $lines += ($buffer =~ tr/\n//);
}
print $lines, "\n";