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HP-UX 11i Version 3: February 2007

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reboot — reboot the system


/usr/sbin/reboot [-h|-r] [-n|-s] [-q] [-t time] [-m message]

/usr/sbin/reboot -R [-H] [-n|-s] [-q] [-t time] [-m message]


The reboot command terminates all currently executing processes except those essential to the system, then reboots the system, or halts, or makes the partition ready for reconfiguration. When invoked without arguments, reboot syncs all disks before rebooting the system.


The reboot command recognizes the following options:


Shut down the system and halt.


Shut down the system and reboot automatically (default).


Shut down the system to a ready-to-reconfigure state and reboot if possible. If the partition is unable to reboot, it will stop at a ready-to-reconfigure state. However, if the -H option is also specified, the system will always stop at ready-to-reconfigure state. This option is available only on systems that support hardware partitions.


Shut down the system to a ready-to-reconfigure state and do not reboot. This option can be used only in combination with the -R option. This option is available only on systems that support hardware partitions.


Do not sync the file systems before shutdown.


Sync the file systems before shutdown; for file systems that were cleanly mounted, modify the fs_clean flag from FS_OK to FS_CLEAN (default).


Quick and quiet. Suppress broadcast of warning messages, terminate processes by brute force (with SIGKILL) and immediately call reboot with arguments as indicated by the other options (see reboot(2)). No logging is performed. The -t and -m options are ignored with this option.

-t time

Specify what time reboot will bring the system down. time can be the word now (indicating immediate shutdown) or a future time in one of two formats: +number and hour:min. The first form brings the system down in number minutes; the second brings the system down at the time of day indicated (based on a 24-hour clock).

-m message

Display message at the terminals of all users on the system at decreasing intervals as reboot time approaches. The message must not contain any embedded double quotes.

At shutdown time a message is written in the file


(if it exists), containing the time of shutdown, who ran reboot, and the reason.

Only users with appropriate privileges can execute the reboot command.


reboot does not invoke the shutdown scripts associated with subsystems to bring them down in a cautious manner. See shutdown(1M).

If the -R option is used in a virtual partition environment on a partitionable system, then the requested reconfiguration will not take place until all the virtual partitions on that hard partition are shut down and the virtual partition monitor is rebooted.


reboot was developed by HP and the University of California, Berkeley.



Shutdown log


vpartition(1), reboot(2), partition(5).

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