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[sysvinit.git] / man / halt.8
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1'\" -*- coding: UTF-8 -*-
2.\" Copyright (C) 1998-2001 Miquel van Smoorenburg.
3.\"
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17.\"
18.\"{{{}}}
19.\"{{{ Title
20.TH HALT 8 "Nov 6, 2001" "" "Linux System Administrator's Manual"
21.\"}}}
22.\"{{{ Name
23.SH NAME
24halt, reboot, poweroff \- stop the system.
25.\"}}}
26.\"{{{ Synopsis
27.SH SYNOPSIS
28.B /sbin/halt
29.RB [ \-n ]
30.RB [ \-w ]
31.RB [ \-d ]
32.RB [ \-f ]
33.RB [ \-i ]
34.RB [ \-p ]
35.RB [ \-h ]
36.br
37.B /sbin/reboot
38.RB [ \-n ]
39.RB [ \-w ]
40.RB [ \-d ]
41.RB [ \-f ]
42.RB [ \-i ]
43.br
44.B /sbin/poweroff
45.RB [ \-n ]
46.RB [ \-w ]
47.RB [ \-d ]
48.RB [ \-f ]
49.RB [ \-i ]
50.RB [ \-h ]
51.\"}}}
52.\"{{{ Description
53.SH DESCRIPTION
54\fBHalt\fP notes that the system is being brought down in the file
55\fI/var/log/wtmp\fP, and then either tells the kernel to halt, reboot or
56power-off the system.
57.PP
58If \fBhalt\fP or \fBreboot\fP is called when the system is
59\fInot\fP in runlevel \fB0\fP or \fB6\fP, in other words when it's running
60normally, \fBshutdown\fP will be invoked instead (with the \fB-h\fP
61or \fB-r\fP flag). For more info see the \fBshutdown\fP(8)
62manpage.
63.PP
64The rest of this manpage describes the behaviour in runlevels 0
65and 6, that is when the systems shutdown scripts are being run.
66.\"}}}
67.\"{{{ Options
68.SH OPTIONS
69.IP \fB\-n\fP
70Don't sync before reboot or halt. Note that the kernel and storage
71drivers may still sync.
72.IP \fB\-w\fP
73Don't actually reboot or halt but only write the wtmp record
74(in the \fI/var/log/wtmp\fP file).
75.IP \fB\-d\fP
76Don't write the wtmp record. The \fB\-n\fP flag implies \fB\-d\fP.
77.IP \fB\-f\fP
78Force halt or reboot, don't call \fBshutdown\fP(8).
79.IP \fB\-i\fP
80Shut down all network interfaces just before halt or reboot.
81.IP \fB\-h\fP
82Put all hard drives on the system in stand-by mode just before halt or power-off.
83.IP \fB\-p\fP
84When halting the system, switch off the power. This is the default when halt is
85called as \fBpoweroff\fP.
86.\"}}}
87.\"{{{ Diagnostics
88.SH DIAGNOSTICS
89If you're not the superuser, you will get the message `must be superuser'.
90.\"}}}
91.\"{{{ Notes
92.SH NOTES
93Under older \fBsysvinit\fP releases , \fBreboot\fP and \fBhalt\fP should
94never be called directly. From release 2.74 on \fBhalt\fP and \fBreboot\fP
95invoke \fBshutdown\fP(8) if the system is not in runlevel 0 or 6. This
96means that if \fBhalt\fP or \fBreboot\fP cannot find out the current
97runlevel (for example, when \fI/var/run/utmp\fP hasn't been initialized
98correctly) \fBshutdown\fP will be called, which might not be what you want.
99Use the \fB-f\fP flag if you want to do a hard \fBhalt\fP or \fBreboot\fP.
100.PP
101The \fB-h\fP flag puts all hard disks in standby mode just before halt
102or power-off. Right now this is only implemented for IDE drives. A side
103effect of putting the drive in stand-by mode is that the write cache
104on the disk is flushed. This is important for IDE drives, since the
105kernel doesn't flush the write cache itself before power-off.
106.PP
107The \fBhalt\fP program uses /proc/ide/hd* to find all IDE disk devices,
108which means that \fI/proc\fP needs to be mounted when \fBhalt\fP or
109\fBpoweroff\fP is called or the \fB-h\fP switch will do nothing.
110.PP
111.\"}}}
112.\"{{{ Author
113.SH AUTHOR
114Miquel van Smoorenburg, miquels@cistron.nl
115.\"}}}
116.\"{{{ See also
117.SH "SEE ALSO"
118.BR shutdown (8),
119.BR init (8)
120.\"}}}