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.\" 30.Dd December 11, 2020 31.Dt LOCK 1 32.Os 33.Sh NAME 34.Nm lock 35.Nd reserve a terminal 36.Sh SYNOPSIS 37.Nm 38.Op Fl npv 39.Op Fl t Ar timeout 40.Sh DESCRIPTION 41The 42.Nm 43utility requests a password from the user, reads it again for verification 44and then will normally not relinquish the terminal until the password is 45repeated. 46There are two other conditions under which it will terminate: it 47will timeout after some interval of time and it may be killed by someone 48with the appropriate permission. 49.Pp 50The following options are available: 51.Bl -tag -width indent 52.It Fl n 53Do not use a timeout value. 54Terminal will be locked forever. 55.It Fl p 56A password is not requested, instead the user's current login password 57is used. 58.It Fl t Ar timeout 59The time limit (default 15 minutes) is changed to 60.Ar timeout 61minutes. 62.It Fl v 63Disable switching virtual terminals while this terminal is locked. 64This option is implemented in a way similar to the 65.Fl S 66option of 67.Xr vidcontrol 1 , 68and thus has the same restrictions. 69It is only available if the terminal in question is a 70.Xr syscons 4 71or 72.Xr vt 4 73virtual terminal. 74.El 75.Sh EXAMPLES 76Lock the terminal for 5 minutes, disable switching virtual terminals and 77require the user's login password to unlock: 78.Pp 79.Dl $ lock -p -t 5 -v 80.Sh SEE ALSO 81.Xr vidcontrol 1 , 82.Xr syscons 4 , 83.Xr vt 4 84.Sh HISTORY 85The 86.Nm 87command appeared in 88.Bx 3.0 . 89