.\"	$OpenBSD: reboot.8,v 1.4 1997/06/22 22:19:10 downsj 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.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
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.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    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 npqd
.Nm reboot
.Op Fl nqd
.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 SIGTERM (and
subsequently a 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 n
If the
.Fl n
option is specified,
the file system cache is not flushed.
This option should probably not be used.
.It Fl q
If the
.Fl q
option is specified,
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 d
If the
.Fl d
option is specified,
the system will create a dump before rebooting.
This option is useful for debugging system dump procedures or
capturing the state of a corrupted or misbehaving system.
.It Fl p
The
.Fl p
option causes the system to power down, if it is being halted, and the
hardware supports automatic power down.
.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
.Pa /etc/rc.shutdown
- The script which is run at shutdown time.
.Sh SEE ALSO
.Xr sync 1 ,
.Xr utmp 5 ,
.Xr boot 8 ,
.Xr shutdown 8
.Sh HISTORY
A
.Nm reboot
command appeared in
.At v6 .