Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages


home | help
REBOOT(8)		  BSD System Manager's Manual		     REBOOT(8)

     reboot, halt, fastboot, fasthalt -- stopping and restarting the system

     halt [-lnqp] [-k kernel]
     reboot [-dlnqp] [-k kernel]
     fasthalt [-lnqp] [-k kernel]
     fastboot [-dlnqp] [-k kernel]

     The halt and reboot utilities flush the file system cache to disk,	send
     all running processes a SIGTERM (and subsequently a SIGKILL) and, respec-
     tively, halt or restart the system.  The action is	logged,	including en-
     tering a shutdown record into the wtmp(5) file.

     The options are as	follows:

     -d	     The system	is requested to	create a crash dump.  This option is
	     supported only when rebooting, and	it has no effect unless	a dump
	     device has	previously been	specified with dumpon(8).

     -k	kernel
	     Boot the specified	kernel on the next system boot.	 If the	kernel
	     boots successfully, the default kernel will be booted on succes-
	     sive boots, this is a one-shot option.  If	the boot fails,	the
	     system will continue attempting to	boot kernel until the boot
	     process is	interrupted and	a valid	kernel booted.	This may
	     change in the future.

     -l	     The halt or reboot	is not logged to the system log.  This option
	     is	intended for applications such as shutdown(8), that call
	     reboot or halt and	log this themselves.

     -n	     The file system cache is not flushed.  This option	should proba-
	     bly not be	used.

     -q	     The system	is halted or restarted quickly and ungracefully, and
	     only the flushing of the file system cache	is performed (if the
	     -n	is not specified).  This option	should probably	not be used.

     -p	     The system	will turn off the power	if it can.  This is of course
	     likely to make reboot rather similar to halt.

     The fasthalt and fastboot utilities are nothing more than aliases for the
     halt and reboot utilities.

     Normally, the shutdown(8) utility is used when the	system needs to	be
     halted or restarted, giving users advance warning of their	impending doom
     and cleanly terminating specific programs.

     wtmp(5), boot(8), dumpon(8), savecore(8), shutdown(8), sync(8)

     A reboot command appeared in Version 6 AT&T UNIX.

BSD				 June 9, 1993				   BSD


Want to link to this manual page? Use this URL:

home | help