system_cmds-336.6.tar.gz

[apple/system_cmds.git] / reboot.tproj / reboot.8

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.\"	@(#)reboot.8	8.1 (Berkeley) 6/9/93
.\" $FreeBSD: src/sbin/reboot/reboot.8,v 1.21 2002/12/27 12:15:33 schweikh Exp $
.\"
.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 lnq
.Nm
.Op Fl lnq
.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
When the system is halted with the halt command, the system is powered off.
.Pp
The options are as follows:
.Bl -tag -width indent
.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
option is not specified).
This option should probably not be used.
.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 and cleanly terminating
specific programs.
.Sh SEE ALSO
.Xr wtmp 5 ,
.Xr shutdown 8 ,
.Xr sync 8
.Sh HISTORY
A
.Nm
utility appeared in
.At v6 .