You should also use the shutdown command to reboot your system. The fastest way to cleanly reboot Linux is to use the -r option, and the word now or the numeral zero (0) :
# shutdown -r now or
Rebooting or shutting down can both have dire consequences if performed at the wrong time (such as during backups or critical file transfers, which arouse the ire of your system's users). However, Linux-based operating systems are designed to properly stop active system services in an orderly fashion. Other commands you can use to shut down and reboot Linux are the halt and reboot commands, but the shutdown command is more flexible.
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