-n, --priority
        The scheduling priority of the process, process group, or user.

-g, --pgrp
        Force who parameters to be interpreted as process group ID's.

-u, --user
        Force the who parameters to be interpreted as user names.

-p, --pid
        Resets the who interpretation to be (the default) process ID's.

-v, --version
        Print version.

-h, --help
        Print help.