gistfile1.txt

---
- hosts: localhost
  gather_facts: no
  vars_files:
    - vars/vaulted_vars.yml
  tasks:
    - debug: var=secret
...

```
 ansible-playbook play.yml --ask-vault-pass -i  'localhost,'
Vault password: 
 __________________ 
< PLAY [localhost] >
 ------------------ 
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||


 ________________________ 
< TASK: debug var=secret >
 ------------------------ 
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||


ok: [localhost] => {
    "secret": "shush!"
}
 ____________ 
< PLAY RECAP >
 ------------ 
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||


localhost                  : ok=1    changed=0    unreachable=0    failed=0   
```