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 power-off
       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.

OPTIONS

       -n     Don't sync before reboot or halt. Note that the kernel and storage drivers may still sync.

       -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 hard drives on the system in stand-by mode just before halt or power-off.

       -p     When halting the system, switch off the power. This is the default when halt is called as poweroff.

DIAGNOSTICS

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

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 hard disks in standby mode just before halt or power-off. Right now this is only implemented for IDE  drives.  A  side
       effect  of  putting  the drive in stand-by 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 power-off.

       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)