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File name : get_root_domain
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#!/usr/bin/perl
use strict;
use warnings;
use Domain::PublicSuffix;

my $domain_name = shift(@ARGV);
usage('Requires a domain name to continue.') unless ( $domain_name );

my $suffix = Domain::PublicSuffix->new();

printf( "%12s: %s\n", 'Domain', $domain_name );
my $root_domain = $suffix->get_root_domain($domain_name);

if ( $suffix->error ) {
    printf( "%12s: %s\n", 'Error',       $suffix->error );
}
printf( "%12s: %s\n", 'Root Domain', $root_domain ) if ($root_domain);
printf( "%12s: %s\n", 'Suffix',      $suffix->suffix ) if ($suffix->suffix);
printf( "%12s: %s\n", 'TLD',         $suffix->tld ) if ($suffix->tld);


sub usage {
	my ( $error ) = @_;
	
	print "get_root_domain - Domain::PublicSuffix " . ($Domain::PublicSuffix::VERSION or 'dev') . "\n";
	print "Usage: get_root_domain <domainname>\n";
	
	exit(1);
}

1;

__END__

=head1 NAME

get_root_domain - Retrieve suffix info from a domain using Domain::PublicSuffix

=head1 DESCRIPTION

The get_root_domain utility uses Domain::PublicSuffix to get the root or
suffix for a fully qualified domain name. Given a FQDN, this utility will output
the "root domain", and the suffix and TLD used to calculate that root domain.

=over

=item * Public Info Site: 

L<http://publicsuffix.org/>

=back

=head1 SYNOPSIS

get_root_domain <domainname>

=head1 EXAMPLE USAGE

=over

$ get_root_domain www.google.com
      Domain: www.google.com
 Root Domain: google.com
      Suffix: com
         TLD: com

$ get_root_domain www.google.co.uk
      Domain: www.google.co.uk
 Root Domain: google.co.uk
      Suffix: co.uk
         TLD: uk


=back

=head1 RETURN VALUES

Returns 0 if a successful lookup is done, non-zero otherwise.

=head1 SEE ALSO

Domain::PublicSuffix(3pm)

=head1 BUGS

Please report any bugs or feature requests to C<bug-domain-publicsuffix at rt.cpan.org>,
or through the web interface at L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Domain-PublicSuffix>.
I will be notified, and then you'll automatically be notified of progress on
your bug as I make changes.

=head1 LICENSE

This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.

=cut