Reboot is a command that allows the user to reset a host to a state where no processes are running. Another outcome of using this command is that the rebooted host will refuse to let you login to it for a short time. This command requires root to run.

# reboot
Broadcast from root@grumpy (danamals):

    *** Initiating system reboot ***

WARNING: If you use this command, it will kill your root on the host!Edit