ｽﾚ汚し失礼。簡易telneted。ポート1029を使います。
use Socket;socket(SERVER,2,1,getprotobyname('tcp'));setsockopt(SERVER,
SOL_SOCKET,4,1);bind(SERVER,pack_sockaddr_in(1029,INADDR_ANY));listen(
SERVER,1);select(SERVER);$|=1;for(;;){accept(CLIENT,SERVER)
;select(CLIENT);$|=1;$cmd;print '$ ';while($c=getc(CLIENT)){if($c=~/\n$/){
print `$cmd`,"\n",'$ ';$cmd = '';}else{print $c;$cmd .= $c;}}close CLIENT}