.\"	$OpenBSD: reboot.8,v 1.22 2001/06/05 15:23:43 aaron Exp $
.\"	$NetBSD: reboot.8,v 1.3 1995/10/05 05:36:21 mycroft Exp $
.\"
.\" Copyright (c) 1990, 1991, 1993
.\"	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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.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 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
.\"	California, Berkeley and its contributors.
.\" 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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.\"	@(#)reboot.8	8.1 (Berkeley) 6/9/93
.\"
.Dd June 9, 1993
.Dt REBOOT 8
.Os
.Sh NAME
.Nm reboot ,
.Nm halt
.Nd stopping and restarting the system
.Sh SYNOPSIS
.Nm halt
.Op Fl dnpq
.Nm reboot
.Op Fl dnq
.Sh DESCRIPTION
The
.Nm halt
and
.Nm reboot
utilities flush the file system cache to disk, run the system
shutdown script, send all running processes a
.Dv SIGTERM
.Pq and subsequently a Dv SIGKILL ,
and, respectively, halt or restart the system.
The action is logged, including entering a shutdown record into the login
accounting file.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl d
Causes system to create a dump before rebooting.
This option is useful for debugging system dump procedures or
capturing the state of a corrupted or misbehaving system.
See
.Xr savecore 8
for information on how to recover this dump.
.It Fl n
Prevent file system cache from being flushed.
This option should probably not be used.
.It Fl q
Quick.
The system is halted or restarted quickly and ungracefully, and only
the flushing of the file system cache is performed.
This option should probably not be used.
.It Fl p
Causes the system to power down, if it is being halted, and the
hardware supports automatic power down.
(Currently supported on some i386, sparc, and mac68k platforms.)
.El
.Pp
Normally, the
.Xr shutdown 8
utility is used when the system needs to be halted or restarted, giving
users advance warning of their impending doom.
.Sh FILES
.Bl -tag -width /etc/rc.shutdown -compact
.It Pa /etc/rc.shutdown
script which is run at shutdown time
.El
.Sh SEE ALSO
.Xr utmp 5 ,
.Xr boot 8 ,
.Xr boot_alpha 8 ,
.Xr boot_amiga 8 ,
.Xr boot_hp300 8 ,
.Xr boot_i386 8 ,
.Xr boot_mac68k 8 ,
.Xr boot_mvme68k 8 ,
.Xr boot_powerpc 8 ,
.Xr boot_sparc 8 ,
.Xr boot_sun3 8 ,
.Xr boot_vax 8 ,
.Xr rc.shutdown 8 ,
.Xr savecore 8 ,
.Xr shutdown 8 ,
.Xr sync 8
.Sh HISTORY
A
.Nm reboot
command appeared in
.At v6 .