https://docs.ansible.com/ansible/latest/user_guide/intro_adhoc.html

ansible all -m ping -vvv
ansible hostname -m ping -vvv
ansible --inventory /etc/ansible/hosts myhost.local -i hosts -m ping
ansible-doc user
ansible-inventory --graph Ubuntu16_4                                           #show members of group "Ubuntu16_4"
ansible-inventory --graph                                                      #show groups
ansible myhost.local -a "sudo apt-get update"
ansible mygroup -a "/sbin/reboot"

/etc/ansible/ansible.cfg