# Registering a variable means storing the output of any task, ad-hoc command inside a another user defined variable so that it can be used efficiently and effectively
---
- name: Registering variable
  hosts: nodes
  tasks:
    - name: Gathering output of all devices on managed hosts ans storing it in variable
      debug:
         msg: "{{ ansible_device_links }}"
      register: device

    - name: printing
      debug:
         var: device.msg.ids.sda 
...