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

In your playbook.yml file, the "command" option can be used to run a command on the target servers. In this example, the ps command will be invoked on the Linux target servers.

---
- hosts: linux
  remote_user: root
  tasks:
    - name: ps command
      command: ps

The playbook can then be executed using this command.

ansible-playbook playbook.yml -i inventory.yml

The following should be produced.

PLAY [all]

TASK [Gathering Facts]
ok: [server1.example.com]

TASK [ps command]
changed: [server1.example.com]

PLAY RECAP
server1.example.com : ok=2  changed=1  unreacable=0  failed=0

By default, no stdout is printed. The - debug option can be used to print output to the console.