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screen: Su

 
 8.4.10 Su
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  -- 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'.
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