my $sock = new IO::Socket::INET( PeerAddr => '127.0.0.1',
                                     PeerPort => 12000,
                                     Proto    => 'tcp',
                                     Blocking => 1);

    print $sock "Hello\n";

##</code><code>##

    my $server = IO::Socket::INET->new( LocalPort => 12000,
                                        Proto     => 'tcp',
                                        Listen    => SOMAXCONN,
                                        Reuse     => 1
    );

    die $! unless $server;

    while (my $sock = $server->accept) {
        print "Connected to sock\n";
        print while <$sock>;
    }

##</code><code>##

use strict;
use warnings;
use IO::Socket::INET;

if ($ARGV[0] == 1) {
    my $server = IO::Socket::INET->new( LocalPort => 12000,
                                        Proto     => 'tcp',
                                        Listen    => SOMAXCONN,
                                        Reuse     => 1
    );

    die $! unless $server;

    while (my $sock = $server->accept) {
        print "Connected to sock\n";
        print while <$sock>;
    }
}

if ($ARGV[0] == 2) {
    my $sock = new IO::Socket::INET( PeerAddr => '127.0.0.1',
                                     PeerPort => 12000,
                                     Proto    => 'tcp',
                                     Blocking => 1
    );

    print "sock is $sock\n";

}

##</code><code>##

$ perl SocketT.pl 1  (to launch as a server)
$ telnet localhost 12000 (in another window, to tie up the server)
$ perl SocketT.pl 2  (to test if it would connect and print out)