.\" Copyright (c) 1987, 1990 The Regents of the University of California.
.\" All rights reserved.
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.\" modification, are permitted provided that the following conditions
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.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
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.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\"	from: @(#)lock.1	6.9 (Berkeley) 7/27/91
.\" %FreeBSD: src/usr.bin/lock/lock.1,v 1.4.2.2 2001/07/22 12:40:19 dd Exp %
.\" $FreeBSD: doc/ja_JP.eucJP/man/man1/lock.1,v 1.4 2001/05/14 01:07:25 horikawa Exp $
.\"
.Dd June 6, 1993
.Dt LOCK 1
.Os
.Sh 名称
.Nm lock
.Nd 端末を予約する
.Sh 書式
.Nm
.Op Fl n
.Op Fl p
.Op Fl t Ar timeout
.Sh 解説
.Nm
はユーザにパスワードを要求し、確認のためにもう一度パスワードを
聞きます。以降そのパスワードがもう一度入力されるまで、
このプログラムはその端末を占有して利用できない状態にします。
このプログラムを終了するには、その他に二つの方法があります:
ひとつは決められた時間まで待ってタイムアウトさせる方法、
もうひとつは権限を持つユーザがそのプロセスを kill するという方法です。
.Pp
オプションは以下のものがあります:
.Bl -tag -width Fl
.It Fl n
タイムアウト値を使用しません。端末を永遠にロックします。
.It Fl p
設定時にパスワードが要求されず、代りにユーザの現行のパスワードが使われます。
.It Fl t Ar timeout
タイムリミットを
.Ar timeout
分に変更します (デフォルトは 15 分)。
.El
.Sh 歴史
.Nm
コマンドは
.Bx 3.0
から登場しました。