halt(8) [centos man page]

HALT(8) 							       halt								   HALT(8)

NAME

       halt, poweroff, reboot - Halt, power-off or reboot the machine

SYNOPSIS

       halt [OPTIONS...]

       poweroff [OPTIONS...]

       reboot [OPTIONS...]

DESCRIPTION

       halt, poweroff, reboot may be used to halt, power-off or reboot the machine.

OPTIONS

       The following options are understood:

       --help
	   Prints a short help text and exits.

       --halt
	   Halt the machine, regardless of which one of the three commands is invoked.

       -p, --poweroff
	   Power-off the machine, regardless of which one of the three commands is invoked.

       --reboot
	   Reboot the machine, regardless of which one of the three commands is invoked.

       -f, --force
	   Force immediate halt, power-off, reboot. Do not contact the init system.

       -w, --wtmp-only
	   Only write wtmp shutdown entry, do not actually halt, power-off, reboot.

       -d, --no-wtmp
	   Do not write wtmp shutdown entry.

       --no-wall
	   Do not send wall message before halt, power-off, reboot.

EXIT STATUS

       On success, 0 is returned, a non-zero failure code otherwise.

NOTES

       These are legacy commands available for compatibility only.

SEE ALSO

       systemd(1), systemctl(1), shutdown(8), wall(1)

systemd 208																   HALT(8)

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)