#!/usr/bin/perl -w
    use strict;
    use IO::Socket;
    my ($host, $port, $kidpid, $handle, $line);


    unless (@ARGV == 2) { die "usage: $0 host port" }
    ($host, $port) = @ARGV;


    # create a tcp connection to the specified host and port
    $handle = IO::Socket::INET->new(Proto     => "tcp",
                                    PeerAddr  => $host,
                                    PeerPort  => $port)
           or die "can't connect to port $port on $host: $!";


    $handle->autoflush(1);              # so output gets there right away
    print STDERR "[Connected to $host:$port]\n";


    # split the program into two processes, identical twins
    die "can't fork: $!" unless defined($kidpid = fork());


    # the if{} block runs only in the parent process
    if ($kidpid) {
        # copy the socket to standard output
        while (defined ($line = <$handle>)) {
            print STDOUT $line;
        }
        kill("TERM", $kidpid);                  # send SIGTERM to child
    }
    # the else{} block runs only in the child process
    else {
        # copy standard input to the socket
        while (defined ($line = <STDIN>)) {
            print $handle $line;
        }
    }