stopping and restarting the system
utilities flush the file system cache to disk, execute the
specified by the pkg_scripts
reverse order, run the system shutdown script, send all running processes a
(and subsequently a
), and, respectively, halt or
restart the system. The action is logged, including entering a shutdown record
into the login accounting file.
The options are as follows:
- Causes system to create a dump before rebooting. This
option is useful for debugging system dump procedures or capturing the
state of a corrupted or misbehaving system. See
for information on how to recover this dump.
- Prevent file system cache from being flushed. This option
should probably not be used.
- Causes the system to power down, if it is being halted, and
the hardware supports automatic power down.
- Quick. The system is halted or restarted quickly and
ungracefully, and only the flushing of the file system cache is performed.
This option should probably not be used.
utility is used when the system needs to be halted or restarted, giving users
advance warning of their impending doom.
command appeared in
Version 6 AT&T UNIX