reboot(8)
NAME
- reboot, halt, fastboot, fasthalt - stopping and restarting
- the system
SYNOPSIS
halt [-lnpq] [-k kernel]
reboot [-dlnpq] [-k kernel]
fasthalt [-lnpq] [-k kernel]
fastboot [-dlnpq] [-k kernel]
DESCRIPTION
- The halt 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).
- -k kernel
- Boot the specified kernel on the next system boot.
- If the kernel
boots successfully, the default kernel will be boot
- ed 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
reboot or halt and log this themselves.
- -n The file system cache is not flushed. This option
- should proba
- bly not be used.
- -p The system will turn off the power if it can. If
- the power down
- action fails, the system will halt or reboot normal
- ly, depending
on whether halt or reboot was called.
- -q The system is halted or restarted quickly and un
- gracefully, and
- only the flushing of the file system cache is per
- formed (if the
-n option is not specified). This option should
- probably not be
used.
- 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 utility appeared in Version 6 AT&T UNIX.
- BSD June 9, 1993