code: function execute() {
          command.exec(env, request.args, request);
          
          // If the request isn't asnync and isn't done, then make it done.
          if (!request.isAsync && !request.isDone) {
              request.done();
          }
      }
docs: Executes the command and ensures request.done is called on the request in
  case it's not marked to be done already or async.