code: function spawnAsExec(command, options, cb) {
    var child = spawn('eval', [command], options);
    child.on('close', cb);
  }
docs: Wraps the node spawn function to work as exec (line, options, callback).
  This avoid the maxBuffer issue, as no buffer will be stored.
  
  @param {string} command The line to execute
  @param {object} options The options to pass to spawn
  @param {function} cb The callback, called with error as first argument