CLI Options

Some of the variables you can like

-e key=value                    # set variable "key" to "value"
-e '{"key":"value"}'            # same in json
-i path/to/inventory_script.ext # load any numbers of inventory variables
-i 1.2.4.4,                     # add a host by ip to this play
--limit 1.2.4.4,                # limit play execution to these hosts
--user your-other-user          # specify a particular username
--noroot                        # don't try becoming root automatically

Note : all ansible-playbook arguments should work.