1.\" $OpenBSD: lock.1,v 1.17 2013/08/14 08:39:26 jmc Exp $ 2.\" 3.\" Copyright (c) 1987, 1990, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" @(#)lock.1 8.1 (Berkeley) 6/6/93 31.\" 32.Dd $Mdocdate: August 14 2013 $ 33.Dt LOCK 1 34.Os 35.Sh NAME 36.Nm lock 37.Nd reserve a terminal 38.Sh SYNOPSIS 39.Nm lock 40.Op Fl np 41.Op Fl a Ar style 42.Op Fl t Ar timeout 43.Sh DESCRIPTION 44.Nm 45requests 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 privileges. 51.Pp 52The options are as follows: 53.Bl -tag -width Ds 54.It Fl a Ar style 55The specified 56.Bx 57Authentication login 58.Ar style 59(as specified in 60.Pa /etc/login.conf ) 61will be used to authenticate the user. 62If the particular 63.Ar style 64requires a challenge/response handshake or a special prompt, the 65user may enter the name of the 66.Ar style 67to get the standard prompt for that 68.Ar style . 69.It Fl n 70Don't use a timeout value. 71Terminal will be locked forever. 72.It Fl p 73A password is not requested, instead the user's current login password 74is used. 75If the user has an S/Key key, they may also use it to unlock the terminal. 76To do this the user should enter 77.Qq s/key 78at the unlock 79.Dq Key: 80prompt. 81The user will then be issued an S/Key 82challenge to which they may respond with a six-word S/Key one-time 83password. 84.It Fl t Ar timeout 85The time limit (default 15 minutes) is changed to 86.Ar timeout 87minutes. 88.El 89.Sh SEE ALSO 90.Xr skey 1 , 91.Xr login.conf 5 92.Sh HISTORY 93The 94.Nm 95command first appeared in 96.Bx 2 . 97.Sh AUTHORS 98.An Kurt Shoens . 99