# ansible-playbook -vv playbooks/test.yml -i inventory/
Using /etc/ansible/ansible.cfg as config file

PLAYBOOK: test.yml *************************************************************
1 plays in playbooks/test.yml

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

TASK [debug] *******************************************************************
task path: /root/testing/12742/mytest/playbooks/test.yml:5
ok: [localhost] => {
    "inventory_group_var": "inventory group var"
}

TASK [debug] *******************************************************************
task path: /root/testing/12742/mytest/playbooks/test.yml:6
ok: [localhost] => {
    "inventory_host_var": "inventory host var"
}

TASK [debug] *******************************************************************
task path: /root/testing/12742/mytest/playbooks/test.yml:7
ok: [localhost] => {
    "playbook_group_var": "playbook group var"
}

TASK [debug] *******************************************************************
task path: /root/testing/12742/mytest/playbooks/test.yml:8
ok: [localhost] => {
    "playbook_host_var": "playbook host var"
}

PLAY RECAP *********************************************************************
localhost                  : ok=4    changed=0    unreachable=0    failed=0   

cat ./inventory/group_vars/all
inventory_group_var: "inventory group var"

cat ./inventory/host_vars/localhost
inventory_host_var: "inventory host var"

cat ./inventory/inv
localhost ansible_connection=local

cat ./playbooks/test.yml
---
- hosts: localhost
  gather_facts: no
  tasks:
  - debug: var=inventory_group_var
  - debug: var=inventory_host_var

ansible-playbook -i inventory/ playbooks/test.yml
PLAY [localhost] ***************************************************************

TASK [debug] *******************************************************************
ok: [localhost] => {
    "inventory_group_var": "inventory group var"
}

TASK [debug] *******************************************************************
ok: [localhost] => {
    "inventory_host_var": "VARIABLE IS NOT DEFINED!"
}

PLAY RECAP *********************************************************************
localhost                  : ok=2    changed=0    unreachable=0    failed=0