请教一下各位大大怎样获取到用户的输入。 具体的需求是：我目前使用adbkit来获取连接到服务器的手机，需要在同一个线程中开启一个服务并监听用户的输入，如果用户输入‘get’，我就返回目前已有的手机信息给它，不知道应该怎样实现？ 现在的代码如下：

#!/usr/bin/env node
var adb = require('adbkit');
var client = adb.createClient();
var cellphones = require("./CellPhones");
var JsonCellList = {"cellphone" : []};

client.trackDevices()
  .then(function(tracker) {
    tracker.on('add', function(device) {
      console.log('Device %s was plugged in', device.id);
      var time = new Date().getTime();
      var item = { "id" : device.id,
		               "type" : device.type,
                   "timestamp" : time,
                   "status" : 0 };
      JsonCellList.cellphone.push(item);
      cellphones.setCells(JsonCellList);
      console.log(cellphones.getCells());
    });
    tracker.on('remove', function(device) {
      console.log('Device %s was unplugged', device.id);
      delId = device.id;
      for(i in JsonCellList.cellphone) {
		if(JsonCellList.cellphone[i].id == delId) JsonCellList.cellphone.splice(i,1);
	}
      cellphones.setCells(JsonCellList);
      console.log(cellphones.getCells());
    });
    tracker.on('end', function() {
      console.log('Tracking stopped');
    });
  })
  .catch(function(err) {
    console.error('Something went wrong:', err.stack);
  });