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. And, for the paranoid,
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.
This page is part of the kbd (Linux keyboard tools) project.
Information about the project can be found at
⟨http://www.kbd-project.org/⟩. If you have a bug report for this man‐
ual page, send it to email@example.com. This page was obtained
from the project's upstream Git repository
2017-04-25. If you discover any rendering problems in this HTML ver‐
sion of the page, or you believe there is a better or more up-to-date
source for the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original man‐
ual page), send a mail to firstname.lastname@example.org
Linux User's Manual 16 May 1996 VLOCK(1)