tos@homer ~/tos/tmp
# cat recip 
#!/usr/bin/perl

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

my $socket=new IO::Socket::INET (LocalPort => 1960,
                              Proto => 'tcp',
                              Listen => 5,
                              Reuse => 1,
                             );
die "could'nt create socket: $!" unless $socket;
while (my $new_socket = $socket->accept()) {
  while (defined (my $buf = <$new_socket>)) {
    print $buf;
         $buf =~ /^ls/ && do { system ("ls") };
  }
}

close ($socket);