NAME
reboot, halt,
fastboot, fasthalt —
stopping and restarting the
system
SYNOPSIS
halt |
[-lnqp] [-k
kernel] |
reboot |
[-dlnqp] [-k
kernel] |
fasthalt |
[-lnqp] [-k
kernel] |
fastboot |
[-dlnqp] [-k
kernel] |
DESCRIPTION
Thehalt and reboot utilities
flush the file system cache to disk, send all running processes a
SIGTERM (and subsequently a
SIGKILL) and, respectively, halt or restart the
system. The action is logged, including entering 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).
-kkernel- Boot the specified kernel on the next system boot. If the kernel boots successfully, the default kernel will be booted on successive 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
rebootorhaltand log this themselves. -n- The file system cache is not flushed. This option should probably 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
-nis 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
rebootrather similar tohalt.
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.
SEE ALSO
wtmp(5), boot(8), dumpon(8), savecore(8), shutdown(8), sync(8)
HISTORY
A reboot command appeared in
4.0BSD.