debug-local.yml

---

- name: Playbook for local debug
  hosts: [all]
  connection: local
  gather_facts: False
  become: no

  tasks:

    - name: get shell environment
      shell: 'env'
      no_log: true
      register: shell_env
      changed_when: False

    - debug: var=shell_env.stdout_lines

    - name: get command environment
      command: 'env'
      no_log: true
      register: command_env
      changed_when: False

    - debug: var=command_env.stdout_lines

    - name: debug variable
      debug:
        msg: "{{ debug_variable | default(omit) }}"
      changed_when: False

    - name: debug all variables
      debug:
        var: hostvars
      changed_when: False
      when: debug_all_variables | default(False)