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HALT(8)		      Linux System Administrator's Manual	       HALT(8)

NAME
       halt, reboot, poweroff -	stop the system.

SYNOPSIS
       /sbin/halt [-n] [-w] [-d] [-f] [-i] [-p]	[-h]
       /sbin/reboot [-n] [-w] [-d] [-f]	[-i]
       /sbin/poweroff [-n] [-w]	[-d] [-f] [-i] [-h]

DESCRIPTION
       Halt  notes  that  the  system  is  being  brought  down	 in  the  file
       /var/log/wtmp, and then either tells the	 kernel	 to  halt,  reboot  or
       poweroff	the system.

       If  halt	or reboot is called when the system is not in runlevel 0 or 6,
       in other	words when it's	running	normally, shutdown will	be invoked in-
       stead  (with the	-h or -r flag).	For more info see the shutdown(8) man-
       page.

       The rest	of this	manpage	describes the behaviour	in runlevels 0 and  6,
       that is when the	systems	shutdown scripts are being run.

OPTIONS
       -n     Don't sync before	reboot or halt.

       -w     Don't actually reboot or halt but	only write the wtmp record (in
	      the /var/log/wtmp	file).

       -d     Don't write the wtmp record. The -n flag implies -d.

       -f     Force halt or reboot, don't call shutdown(8).

       -i     Shut down	all network interfaces just before halt	or reboot.

       -h     Put all harddrives on the	system in  standby  mode  just	before
	      halt or poweroff.

       -p     When halting the system, do a poweroff. This is the default when
	      halt is called as	poweroff.

DIAGNOSTICS
       If you're not the superuser, you	will get the message  `must  be	 supe-
       ruser'.

NOTES
       Under  older sysvinit releases ,	reboot and halt	should never be	called
       directly. From release 2.74 on halt and reboot  invoke  shutdown(8)  if
       the system is not in runlevel 0 or 6. This means	that if	halt or	reboot
       cannot find out the current runlevel (for example,  when	 /var/run/utmp
       hasn't been initialized correctly) shutdown will	be called, which might
       not be what you want.  Use the -f flag if you want to do	a hard halt or
       reboot.

       The  -h	flag  puts  all	 harddisks in standby mode just	before halt or
       poweroff. Right now this	is only	implemented for	IDE drives. A side ef-
       fect  of	 putting  the drive in standby mode is that the	write cache on
       the disk	is flushed. This is important for IDE drives, since the	kernel
       doesn't flush the write-cache itself before poweroff.

       The halt	program	uses /proc/ide/hd* to find all IDE disk	devices, which
       means that /proc	needs to be mounted when halt or poweroff is called or
       the -h switch will do nothing.

AUTHOR
       Miquel van Smoorenburg, miquels@cistron.nl

SEE ALSO
       shutdown(8), init(8)

				  Nov 6, 2001			       HALT(8)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | DIAGNOSTICS | NOTES | AUTHOR | SEE ALSO

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