perldoc -q find.+?my.+?ip
Found in /perl58/lib/pod/perlfaq9.pod
  How do I find out my hostname/domainname/IP address?
    The normal way to find your own hostname is to call the `hostname`
    program. While sometimes expedient, this has some problems, such a
+s not
    knowing whether you've got the canonical name or not. It's one of 
+those
    tradeoffs of convenience versus portability.

    The Sys::Hostname module (part of the standard perl distribution) 
+will
    give you the hostname after which you can find out the IP address
    (assuming you have working DNS) with a gethostbyname() call.

        use Socket;
        use Sys::Hostname;
        my $host = hostname();
        my $addr = inet_ntoa(scalar gethostbyname($host || 'localhost'
+));

    Probably the simplest way to learn your DNS domain name is to grok
+ it
    out of /etc/resolv.conf, at least under Unix. Of course, this assu
+mes
    several things about your resolv.conf configuration, including tha
+t it
    exists.

    (We still need a good DNS domain name-learning method for non-Unix
    systems.)





$$ perl
    use Socket;
    use Sys::Hostname;
    my $host = hostname();
    my $addr = inet_ntoa(scalar gethostbyname($host || 'localhost'));


    die "$host ][ $addr $/";
__END__
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