Usando REPL via un socket TCP

[~/Dropbox/src/javascript/node.js/repl(master)]$ cat repl_server.js 
var net = require("net"),
    repl = require("repl");

connections = 0;

net.createServer(function (socket) {
  connections += 1;
  repl.start({
    prompt: "node via TCP socket> ",
    input: socket,
    output: socket
  }).on('exit', function() {
    socket.end();
  });
}).listen(5001);

[~/Dropbox/src/javascript/node.js/repl(master)]$ node repl_server.js

Podemos ahora usar netcat para comunicar con el servidor:

[~/Dropbox/src/javascript/node.js/hector_correa_introduction_to_node(master)]$ nc -v localhost 5001
nc: connect to localhost port 5001 (tcp) failed: Connection refused
Connection to localhost 5001 port [tcp/commplex-link] succeeded!
node via TCP socket> a = 2+3
5
node via TCP socket> a
5
node via TCP socket> .exit
[~/Dropbox/src/javascript/node.js/hector_correa_introduction_to_node(master)]$