:: VV VV LL OOO CCCCC KK KK VV VV LL OO OO CC KK KK originally written by VV VV LL OO OO CC KK Michael K. Johnson VV VV LL OO OO CC KK KK for Linux Journal VVV LLLLLLLL OOO CCCCC KK KK This is vlock, the Linux _V_irtual Console locking program. It allows you to lock one or all of the sessions of your Linux console display. Usage is very simple; by default, vlock locks the single console or terminal you are on. If you want to lock the console completely so that no one else can log into any of the virtual consoles (perhaps because you have login sessions running on several other virtual consoles at the same time), you use the -a or --all flag to cause vlock to not allow any user to switch to any console without typing your password. WARNING: If you lock all the consoles, they will be *really* locked. Unless you have a serial terminal, or can log in remotely to kill vlock, you *will not* be able to get back to your terminal session without correct authentication. After a new installation always test vlock in a terminal to verify that authentication is set up correctly. If you loose data because you have to reset your computer because of vlock -a, it is your own problem, not mine. I warned you. The root user will *always* be able to unlock any vlock session, unless disabled at compile time. vlock consists of several plugins. Some of them are potentially dangerous and access to them should be restricted. Please refer to SECURITY for a detailed description. "vlock -h" or "vlock --help" will get you a help message. To make vlock switch to a new console before locking, use the -n or --new flag. If installed with proper permissions this even works from an X11 session. The -n flag implies -a and thus all warnings about -a also apply to -n. vlock is maintained by Frank Benkstein <firstname.lastname@example.org>.