Ansible - Check if string exists in file

Question

I\'m very new to Ansible

Is it possible to check if a string exists in a file using Ansible.

I want to check is a user has access to a server. this can be

Answer 1

If you want to fail if there is no user:

tasks:
  - shell: grep username /etc/passwd
    changed_when: false

By default shell module will fail if command exit code is non zero.
So it will give you ok if username is there and fails otherwise.
I use changed_when: false to prevent changed state when grepping.