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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 systems passwd database,
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.