code: function start(){
        // TCP or unix-domain socket repl
        server = net.createServer(function(sock){
          sockets.push(sock);
          var ctx = repl.start('cluster> ', sock).context;
          master.emit('repl socket', sock);
  
          // augment socket to provide some formatting methods
          sock.title = function(str){ this.write('\n  \033[36m' + str + '\033[0m\n'); }
          sock.row = function(key, val){ this.write('  \033[90m' + key + ':\033[0m ' + val + '\n'); }
  
          // merge commands into context
          // executing in context of master
          Object.keys(exports).forEach(function(cmd){
            ctx[cmd] = function(){
              var args = Array.prototype.slice.call(arguments);
              args.unshift(master, sock);
              return exports[cmd].apply(master, args);
            };
          });
        });
  
        // Apply all arguments given
        server.listen.apply(server, args);
      }
docs: start repl