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halt, reboot

halt, reboot

halt  
reboot Stops the system.
Restarts the system.  
halt [-nqd]  
reboot [-nqd]  
The halt and reboot utilities flush the system cache to disk, send all running processes a SIGTERM and subsequently a SIGKILL and, respectively, halts or restarts the system. The action is logged, including adding a shutdown record into the login accounting file.
-n Does not flush the file system cache. This option probably should not be used.
-q Quickly and ungracefully halts/restarts the system, and only flushes the file system cache. This option probably should not be used.
-d Creates a dump before rebooting. This option is useful for debugging system dump procedures or capturing the state of a corrupted or misbehaving system.
Normally, shutdown (8) is used when the system needs to be halted or restarted to warn users of their impending doom.



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