.\" Copyright (c) 1990, 1991, 1993
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.\"	@(#)reboot.8	8.1 (Berkeley) 6/9/93
.\" $FreeBSD: src/sbin/reboot/reboot.8,v 1.10.2.7 2003/02/23 22:42:10 trhodes Exp $
.\" $DragonFly: src/sbin/reboot/reboot.8,v 1.3 2005/08/01 01:49:17 swildner Exp $
.\"
.Dd June 9, 1993
.Dt REBOOT 8
.Os
.Sh NAME
.Nm reboot ,
.Nm halt ,
.Nm fastboot ,
.Nm fasthalt
.Nd stopping and restarting the system
.Sh SYNOPSIS
.Nm halt
.Op Fl lnqp
.Op Fl k Ar kernel
.Nm
.Op Fl dlnqp
.Op Fl k Ar kernel
.Nm fasthalt
.Op Fl lnqp
.Op Fl k Ar kernel
.Nm fastboot
.Op Fl dlnqp
.Op Fl k Ar kernel
.Sh DESCRIPTION
The
.Nm halt
and
.Nm
utilities flush the file system cache to disk, send all running processes
a
.Dv SIGTERM
(and subsequently a
.Dv SIGKILL )
and, respectively, halt or restart the system.
The action is logged, including entering a shutdown record into the
.Xr wtmp 5
file.
.Pp
The options are as follows:
.Bl -tag -width indent
.It Fl d
The system is requested to create a crash dump.
This option is
supported only when rebooting, and it has no effect unless a dump
device has previously been specified with
.Xr dumpon 8 .
.It Fl k Ar kernel
Boot the specified
.Ar kernel
on the next system boot.
If the kernel boots successfully, the
.Em default
kernel will be booted on successive boots, this is a one-shot option.
If the boot fails, the system will continue attempting to boot
.Ar kernel
until the boot process is interrupted and a valid kernel booted.
This may change in the future.
.It Fl l
The halt or reboot is
.Em not
logged to the system log.
This option is intended for applications such as
.Xr shutdown 8 ,
that call
.Nm
or
.Nm halt
and log this themselves.
.It Fl n
The file system cache is not flushed.
This option should probably not be used.
.It Fl q
The system is halted or restarted quickly and ungracefully, and only
the flushing of the file system cache is performed (if the
.Fl n
is not specified).
This option should probably not be used.
.It Fl p
The system will turn off the power
if it can.
This is of course likely to make
.Nm
rather similar to
.Nm halt .
.El
.Pp
The
.Nm fasthalt
and
.Nm fastboot
utilities are nothing more than aliases for the
.Nm halt
and
.Nm
utilities.
.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 and cleanly terminating
specific programs.
.Sh SEE ALSO
.Xr wtmp 5 ,
.Xr boot 8 ,
.Xr dumpon 8 ,
.Xr savecore 8 ,
.Xr shutdown 8 ,
.Xr sync 8
.Sh HISTORY
A
.Nm
command appeared in
.At v6 .