Ad-hoc commands in Ansible allow you to execute simple tasks at the command line against one or all of your hosts.
An ad-hoc command consists of two parameters: the host group that defines on what machines to run the task against and the Ansible module to run.
These parameters are passed to the ansible binary for invocation.
Running ad-hoc commands
ping all hosts
ansible all -m ping
execute the command "uptime" on all hosts
ansible all -m shell -a 'uptime'
run the command disk usage using the inventory json file on all hosts
ansible all -i inventory.json -m shell -a 'df -h'
install the package git as root user on the target host using the inventory.yml file
ansible test-db-001.mydomain.com -i inventory.yml -b -m package -a "name=git state=present"