reboot(8) - NetBSD Manual Pages

REBOOT(8)               NetBSD System Manager's Manual               REBOOT(8)


NAME
reboot, poweroff, halt -- restarting, powering down and stopping the sys- tem
SYNOPSIS
halt [-dlnpq] poweroff [-dlnq] reboot [-dlnq]
DESCRIPTION
The poweroff, halt and reboot utilities flush the file system cache to disk, send all running processes a SIGTERM, wait for several 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 enter- ing a shutdown record into the login accounting file and sending a mes- sage via syslog(3). The options are as follows: -d Create a dump before halting or restarting. This option is use- ful for debugging system dump procedures or capturing the state of a corrupted or misbehaving system. -l Suppress sending a message via syslog(3) before halting or restarting. -n Do not flush the file system cache. This option should be used with extreme caution. It can be used if a disk or the processor is on fire. -p Attempt to powerdown the system. If the powerdown fails, or the system does not support software powerdown, the system will halt. This option is only valid for halt. -q Do not give processes a chance to shut down before halting or restarting. This option should not normally be used. Normally, the shutdown(8) utility is used when the system needs to be halted or restarted, giving users advance warning of their impending doom.
SEE ALSO
reboot(2), syslog(3), utmp(5), boot(8), shutdown(8), sync(8)
HISTORY
A reboot command appeared in Version 6 AT&T UNIX. The poweroff command first appeared in NetBSD 1.5.
CAVEATS
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.
BUGS
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. NetBSD 3.0.1 April 4, 2003 NetBSD 3.0.1

Powered by man-cgi (2024-08-26). Maintained for NetBSD by Kimmo Suominen. Based on man-cgi by Panagiotis Christias.