test123

test123.yml

---
- hosts: localhost
  connection: local
  tasks:
    - name: run a shell command
      shell: cat /tmp/123
      register: shell_output
      # failed_when: false # do not print out json blob if it fails
      ignore_errors: yes  # print out json blob with error message
      changed_when: false

    - name: print out the message if its a standard error
      debug:
        msg: "Error message is {{ shell_output.stderr }}"
      when: shell_output.rc != 0