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

    print $sock "Hello\n";

    my $server = IO::Socket::INET->new( LocalPort => 12000,
                                        Proto     => 'tcp',
...
        print "Connected to sock\n";
        print while <$sock>;
    }

use strict;
use warnings;
...
    print "sock is $sock\n";

}

$ 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)