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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 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.
-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 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 run-
level (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.
AUTHOR
Miquel van Smoorenburg, miquels AT cistron.nl
SEE ALSO
shutdown(8), init(8)
Nov 6, 2001 HALT(8)
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