#!/usr/bin/perl -wT

use Digest::MD5;
use File::Find;
use IO::File;
use strict;

$| = 1;

$ENV{'PATH'} = '/bin:/usr/bin:/usr/local/bin';

my $ctx = Digest::MD5->new;
my %digest;

my $path = $ARGV[0] || '.';

find ({
    'wanted'    =>    sub {
        if (-f $_) {
            lstat;
            if ((-r _) && (!-l _)) {
                $ctx->reset;
                my $fh = IO::File->new($_, 'r');
                $ctx->addfile(\$fh);
                my $md5 = $ctx->hexdigest;
                if (exists $digest{$md5}) {
                    push @{$digest{$md5}->{'dupes'}}, $_;
                } else {
                    $digest{$md5} = {
                        'file'      =>  $_,
                        'dupes'     =>  []
                    }
                }
            }
        } else {
            print "Searching $_\n";
        }
    },
    'no_chdir'    =>    1
}, $path);

print "There are ", ((scalar @{$digest{$_}->{'dupes'}}) || 0), " duplicate files.\n";

exit 0;