1.\" Copyright (c) 1987, 1990, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)lock.1 8.1 (Berkeley) 6/6/93 29.\" $FreeBSD: src/usr.bin/lock/lock.1,v 1.4.2.4 2002/09/15 22:32:56 dd Exp $ 30.\" $DragonFly: src/usr.bin/lock/lock.1,v 1.3 2008/05/02 02:05:07 swildner Exp $ 31.\" 32.Dd July 10, 2002 33.Dt LOCK 1 34.Os 35.Sh NAME 36.Nm lock 37.Nd reserve a terminal 38.Sh SYNOPSIS 39.Nm 40.Op Fl npv 41.Op Fl t Ar timeout 42.Sh DESCRIPTION 43The 44.Nm 45utility requests a password from the user, reads it again for verification 46and then will normally not relinquish the terminal until the password is 47repeated. 48There are two other conditions under which it will terminate: it 49will timeout after some interval of time and it may be killed by someone 50with the appropriate permission. 51.Pp 52Options: 53.Bl -tag -width Fl 54.It Fl n 55Don't use a timeout value. Terminal will be locked forever. 56.It Fl p 57A password is not requested, instead the user's current login password 58is used. 59.It Fl t Ar timeout 60The time limit (default 15 minutes) is changed to 61.Ar timeout 62minutes. 63.It Fl v 64Disable switching virtual terminals while this terminal is locked. 65This option is implemented in a way similar to the 66.Fl S 67option of 68.Xr vidcontrol 1 , 69and is only available if the terminal in question is a 70.Xr syscons 4 71virtual terminal. 72.El 73.Sh HISTORY 74The 75.Nm 76command appeared in 77.Bx 3.0 . 78