vlock man page on SuSE

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VLOCK(1)							      VLOCK(1)

NAME
       vlock - Virtual Console lock program

SYNOPSIS
       vlock

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

DESCRIPTION
       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.

       When  locking  the  entire console display it is still possible to kill
       vlock using the Secure Access Key (SAK)	or  other  commands  that  are
       available  through the sysrq mechanism when that was enabled.  When the
       -s,--disable-sysrq is given the sysrq mechanism is disabled while vlock
       is  running  and	 reenabled  on	exit.	See  /usr/src/linux/Documenta‐
       tion/sysrq.txt for more details.

       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.

OPTIONS
       -a,--all

	      Lock all console sessions and disable VC switching.

       -s,--disable-sysrq

	      Disable sysrq while consoles are locked. Does  not  have	effect
	      unless the -a,--all option is also specified.

       -c,--current

	      Lock the current session (this is the default).

       -h,--help

	      Print a brief help message.

       -v,--version

	      Print the version number of vlock.

AUTHOR
       Michael K. Johnson <johnsonm@redhat.com>

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