124 lines
4.0 KiB
Groff
124 lines
4.0 KiB
Groff
'\" -*- coding: UTF-8 -*-
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.\" Copyright (C) 1998-2001 Miquel van Smoorenburg.
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.\"
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.\" This program is free software; you can redistribute it and/or modify
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.\" it under the terms of the GNU General Public License as published by
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.\" the Free Software Foundation; either version 2 of the License, or
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.\" (at your option) any later version.
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.\"
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.\" This program is distributed in the hope that it will be useful,
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.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.\" GNU General Public License for more details.
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.\"
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.\" You should have received a copy of the GNU General Public License
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.\" along with this program; if not, write to the Free Software
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.\" Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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.\"
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.\"{{{}}}
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.\"{{{ Title
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.TH HALT 8 "Nov 6, 2001" "" "Linux System Administrator's Manual"
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.\"}}}
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.\"{{{ Name
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.SH NAME
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halt, reboot, poweroff \- stop the system.
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.\"}}}
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.\"{{{ Synopsis
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.SH SYNOPSIS
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.B /sbin/halt
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.RB [ \-n ]
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.RB [ \-w ]
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.RB [ \-d ]
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.RB [ \-f ]
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.RB [ \-i ]
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.RB [ \-p ]
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.RB [ \-h ]
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.br
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.B /sbin/reboot
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.RB [ \-n ]
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.RB [ \-w ]
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.RB [ \-d ]
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.RB [ \-f ]
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.RB [ \-i ]
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.br
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.B /sbin/poweroff
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.RB [ \-n ]
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.RB [ \-w ]
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.RB [ \-d ]
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.RB [ \-f ]
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.RB [ \-i ]
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.RB [ \-h ]
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.\"}}}
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.\"{{{ Description
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.SH DESCRIPTION
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\fBhalt\fP notes that the system is being brought down in the file
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\fI/var/log/wtmp\fP, and then either tells the kernel to halt, reboot or
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power-off the system.
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.PP
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If \fBhalt\fP or \fBreboot\fP is called when the system is
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\fInot\fP in runlevel \fB0\fP or \fB6\fP, in other words when it's running
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normally, \fBshutdown\fP will be invoked instead (with the \fB-h\fP
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or \fB-r\fP flag). For more info see the \fBshutdown\fP(8)
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manpage.
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.PP
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The rest of this manpage describes the behaviour in runlevels 0
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and 6, that is when the systems shutdown scripts are being run.
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.\"}}}
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.\"{{{ Options
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.SH OPTIONS
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.IP \fB\-n\fP
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Don't sync before reboot or halt. Note that the kernel and storage
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drivers may still sync. This implies \fB\-d\fP.
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.IP \fB\-w\fP
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Don't actually reboot or halt but only write the wtmp record
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(in the \fI/var/log/wtmp\fP file).
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.IP \fB\-d\fP
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Don't write the wtmp record.
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.IP \fB\-f\fP
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Force halt or reboot, don't call \fBshutdown\fP(8).
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.IP \fB\-i\fP
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Shut down all network interfaces just before halt or reboot.
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Warning: This may not work on interfaces which do not have an IP address
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and should ideally be handled by a network manager service.
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.IP \fB\-h\fP
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Put all hard drives on the system in stand-by mode just before halt or power-off.
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.IP \fB\-p\fP
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When halting the system, switch off the power. This is the default when halt is
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called as \fBpoweroff\fP.
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.\"}}}
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.\"{{{ Diagnostics
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.SH DIAGNOSTICS
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If you're not the superuser, you will get the message `must be superuser'.
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.\"}}}
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.\"{{{ Notes
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.SH NOTES
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Under older \fBsysvinit\fP releases , \fBreboot\fP and \fBhalt\fP should
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never be called directly. From release 2.74 on \fBhalt\fP and \fBreboot\fP
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invoke \fBshutdown\fP(8) if the system is not in runlevel 0 or 6. This
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means that if \fBhalt\fP or \fBreboot\fP cannot find out the current
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runlevel (for example, when \fI/var/run/utmp\fP hasn't been initialized
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correctly and /var/run/runlevel does not exist) \fBshutdown\fP will be called,
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which might not be what you want.
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Use the \fB-f\fP flag if you want to do a hard \fBhalt\fP or \fBreboot\fP.
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.PP
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The \fB-h\fP flag puts all hard disks in standby mode just before halt
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or power-off. Right now this is only implemented for IDE drives. A side
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effect of putting the drive in stand-by mode is that the write cache
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on the disk is flushed. This is important for IDE drives, since the
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kernel doesn't flush the write cache itself before power-off.
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.PP
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The \fBhalt\fP program uses /proc/ide/hd* to find all IDE disk devices,
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which means that \fI/proc\fP needs to be mounted when \fBhalt\fP or
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\fBpoweroff\fP is called or the \fB-h\fP switch will do nothing.
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.PP
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.\"}}}
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.\"{{{ Author
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.SH AUTHOR
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Miquel van Smoorenburg, miquels@cistron.nl
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.\"}}}
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.\"{{{ See also
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.SH "SEE ALSO"
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.BR shutdown (8),
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.BR init (8)
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.\"}}}
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