gistfile1.txt

PLAY [localhost] ***************************************************************

TASK [Test Case 1] *************************************************************
changed: [localhost]

TASK [debug] *******************************************************************
ok: [localhost] => {
    "msg": "who is handsome man? smallplane"
}

TASK [Test Case 2] *************************************************************
changed: [localhost]

TASK [debug] *******************************************************************
ok: [localhost] => {
    "msg": "who is handsome man? smallplane"
}

TASK [Test Case 3] *************************************************************
changed: [localhost]

TASK [debug] *******************************************************************
ok: [localhost] => {
    "msg": "who is handsome man? 'smallplane'"
}

TASK [Test Case 4] *************************************************************
changed: [localhost]

TASK [debug] *******************************************************************
ok: [localhost] => {
    "msg": "who is handsome man? \"smallplane\""
}

TASK [Test Case 5 - Failed case] ***********************************************
changed: [localhost]

TASK [debug] *******************************************************************
ok: [localhost] => {
    "msg": "who is handsome man? smallplane"
}

TASK [Test Case 6 - Failed case] ***********************************************
changed: [localhost]

TASK [debug] *******************************************************************
ok: [localhost] => {
    "msg": "who is handsome man? smallplane"
}

TASK [Test Case 7] *************************************************************
changed: [localhost]

TASK [debug] *******************************************************************
ok: [localhost] => {
    "msg": "who is handsome man? smallplane"
}

PLAY RECAP *********************************************************************
localhost                  : ok=14   changed=7    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

string.yml

---
- hosts: localhost
  gather_facts: no
  vars:
    string_testing: "smallplane"

  tasks:
    - name: Test Case 1
      command:
        cmd: echo "who is handsome man? {{ string_testing }}"
      register: case1_result

    - debug:
        msg: "{{ case1_result.stdout }}"

    - name: Test Case 2
      command:
        cmd: "echo 'who is handsome man? {{ string_testing }}'"
      register: case2_result

    - debug:
        msg: "{{ case2_result.stdout }}"

    - name: Test Case 3
      command:
        cmd: echo "who is handsome man? '{{ string_testing }}'"
      register: case3_result

    - debug:
        msg: "{{ case3_result.stdout }}"

    - name: Test Case 4
      command:
        cmd: echo 'who is handsome man? "{{ string_testing }}"'
      register: case4_result

    - debug:
        msg: "{{ case4_result.stdout }}"

    - name: Test Case 5 - Failed case
      command:
        cmd: echo 'who is handsome man? '{{ string_testing }}''
      register: case5_result

    - debug:
        msg: "{{ case5_result.stdout }}"

    - name: Test Case 6 - Failed case
      command:
        cmd: echo "who is handsome man? "{{ string_testing }}""
      register: case6_result

    - debug:
        msg: "{{ case6_result.stdout }}"

    - name: Test Case 7
      command:
        cmd: 'echo "who is handsome man? {{ string_testing }}"'
      register: case7_result

    - debug:
        msg: "{{ case7_result.stdout }}"