netbsd man page for lock

LOCK(1) 						    BSD General Commands Manual 						   LOCK(1)

NAME
     lock -- reserve a terminal

SYNOPSIS
     lock [-np] [-t timeout]

DESCRIPTION
     lock requests a password from the user, reads it again for verification and then will normally not relinquish the terminal until the password
     is repeated.  There are two other conditions under which it will terminate: it will timeout after some interval of time and it may be killed
     by someone with the appropriate permission.

     Options:

     -n 	 No timeout is used.  The terminal will be locked indefinitely or until current challenge is met.

     -p 	 A password is not requested, instead the user's current login password is used.  If the user has an S/Key key, they may also use
		 it to unlock the terminal.  To do this the user should enter "s/key" at the unlock "Key:" prompt.  The user will then be issued
		 an S/Key challenge to which they may respond with a six-word S/Key one-time password.

     -t timeout  The time limit (default 15 minutes) is changed to timeout minutes.

SEE ALSO
     skey(1)

HISTORY
     The lock command appeared in 3.0BSD.

BSD
								   June 6, 1993 							       BSD