This assumes you have installed Ansible Tower and are familiar with the ansible-playbook command and the shell command.

Register can be used to store the output and return code of a command. In this example, the output and return code of the ps command will be stored in "out".

- name: ps command
  shell: "ps"
  register: out

You can then do something with the register, such as printing the output and return code.

- debug: msg="{{out.stdout_lines}}"
- debug: msg="{{out.stderr}}"
- debug: msg="{{out.rc}}"