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我正在尝试一个简单的任务,找出两个文件之间的差异,并将其存储在记事本中.我不能用命令和shell来做.请说明我错在哪里 -

---
- hosts: myserver
  tasks:
   - name: get the difference
     command: diff hosts.new hosts.mod
     register: diff
   - debug: var=diff.cmd

错误 -

fatal: [zlp12037]: FAILED! => {"changed": true, "cmd": ["diff", "hosts.new", "hosts.mod"], "delta": "0:00:00.003102", "end": "2017-03-29 10:17:34.448063", "failed": true, "rc": 1, "start": "2017-03-29 10:17:34.444961", "stderr": "", "stdout":