VLOCK(1)                                                              VLOCK(1)


       vlock - Virtual Console lock program



       vlock [ -a,--all ] [ -c,--current ] [ -h,--help ] [ -v,--version ]


       vlock  is  a program to lock one or more sessions on the Linux console.
       This is especially useful for Linux machines which have multiple  users
       with  access  to  the console.  One user may lock his or her session(s)
       while still allowing other users to use the  system  on  other  virtual
       consoles.   If  desired,  the  entire console may be locked and virtual
       console switching disabled.

       By default, only the current VC (virtual console) is locked.  With  the
       -a,-all  option  all VCs are locked.  The locked VCs cannot be unlocked
       without the invoker’s password or the root password.  The root password
       will  always be able to unlock any or all sessions.  And, for the para-
       noid, vlock makes it a trying experience for those attempting to  guess
       the  password, so unauthorized access to session(s) is highly unlikely.

       Please note that it is entirely possible to  completely  lock  yourself
       out of the console with the -a,--all option if you cannot remember your
       password!  Unless you are able to kill vlock by logging in remotely via
       a  serial  terminal  or  network,  a  hard  reset is the only method of
       ‘‘unlocking’’ the display.

       vlock works for console sessions primarily.  However, there is  support
       for  trying  to lock non-console sessions as well, but that support has
       not been well tested.



              Lock all console sessions and disable VC switching.


              Lock the current session (this is the default).


              Print a brief help message.


              Print the version number of vlock.


       Michael K. Johnson <johnsonm@redhat.com>

Linux User’s Manual               16 May 1996                         VLOCK(1)

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