4.2BSD/usr/man/man1/lock.1

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.TH LOCK 1 "24 February 1979"
.UC
.SH NAME
lock \- reserve a terminal
.SH SYNOPSIS
.B lock
.SH DESCRIPTION
.I Lock
requests a password from the user, then prints "LOCKED" on
the terminal and refuses to relinquish the terminal until
the password is repeated.  If the user forgets the password,
he has no other recourse but to login elsewhere and kill
the lock process.
.SH AUTHOR
Kurt Shoens
.SH BUGS
Should timeout after 15 minutes.