REBOOT(8) | System Manager's Manual | REBOOT(8) |
reboot
, poweroff
,
halt
— restarting, powering
down and stopping the system
halt |
[-dlnpqvxz ] |
poweroff |
[-dlnqvxz ] |
reboot |
[-dlnqvxz ] [arg ...] |
The poweroff
, halt
and reboot
utilities flush the file system cache to
disk, send all running processes a SIGTERM
, wait for
up to 30 seconds for them to die, send a SIGKILL
to
the survivors and, respectively, power down, halt or restart the system. The
action is logged, including entering a shutdown record into the login
accounting file and sending a message via
syslog(3).
The options are as follows:
-d
-l
-n
-p
halt
.-v
AB_VERBOSE
to
reboot(2).-x
AB_DEBUG
to
reboot(2).-z
AB_SILENT
to
reboot(2).-q
If there are any arguments passed to
reboot
they are concatenated with spaces and passed
as bootstr to the
reboot(2) system call. The
string is passed to the firmware on platforms that support it.
Normally, the shutdown(8) utility is used when the system needs to be halted or restarted, giving users advance warning of their impending doom.
reboot(2), syslog(3), utmp(5), boot(8), init(8), rescue(8), shutdown(8), sync(8)
A reboot
command appeared in
4.0BSD.
The poweroff
command first appeared in
NetBSD 1.5.
Once the command has begun its work, stopping it before it completes will probably result in a system so crippled it must be physically reset. To prevent premature termination, the command blocks many signals early in its execution. However, nothing can defend against deliberate attempts to evade this.
This command will stop the system without running any shutdown(8) scripts. Amongst other things, this means that swapping will not be disabled so that raid(4) can shutdown cleanly. You should normally use shutdown(8) unless you are running in single user mode.
The single user shell will ignore the
SIGTERM
signal. To avoid waiting for the timeout
when rebooting or halting from the single user shell, you have to
exec reboot
or exec
halt
.
September 12, 2016 | NetBSD 10.99 |