None.
su [username [password [password2]]]
Substitute the user of a display. The command prompts for all parameters
that are omitted. If passwords are specified as parameters, they have to
be specified un-crypted. The first password is matched against the
system's passwd database and the second password is matched against the
screen password as set with the commands acladd or
password. su may be useful for the screen administrator
to test multiuser setups. When the identification fails, the user has
access to the commands available for user nobody. These are
detach, license, version, help and
displays.
None yet.