FAQ 9.23 How do I find out my hostname, domainname, or IP address?

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9.23: How do I find out my hostname, domainname, or IP address?

    (contributed by brian d foy)

    The "Net::Domain" module, which is part of the standard distribution
    starting in perl5.7.3, can get you the fully qualified domain name
    (FQDN), the host name, or the domain name.

            use Net::Domain qw(hostname hostfqdn hostdomain);

            my $host = hostfqdn();

    The "Sys::Hostname" module, included in the standard distribution since
    perl5.6, can also get the hostname.

            use Sys::Hostname;

            $host = hostname();

    To get the IP address, you can use the "gethostbyname" built-in function
    to turn the name into a number. To turn that number into the dotted
    octet form (a.b.c.d) that most people expect, use the "inet_ntoa"
    function from the "Socket" module, which also comes with perl.

            use Socket;

            my $address = inet_ntoa(
                    scalar gethostbyname( $host || 'localhost' )


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