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(screen.info)Su

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Su
--

 - Command: su [USERNAME [PASSWORD [PASSWORD2]]]
     (none)
     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'.