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RedHat 9 (Linux i386) - man page for halt (redhat section 8)

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

       halt, reboot, poweroff - stop the system.

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

       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 instead (with the -h or -r flag). For more
       info see the shutdown(8) manpage.

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

       -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

       -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

       If you're not the superuser, you will get the message `must be superuser'.

       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 effect 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.

       Miquel van Smoorenburg, miquels@cistron.nl

       shutdown(8), init(8)

					   Nov 6, 2001					  HALT(8)

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