reboot [options]
System administration command. Close out filesystems, shut down the system, then reboot. Because this command immediately stops all processes, it should be run only in single-user mode. If the system is not in runlevel 0 or 6, reboot calls shutdown -r.
Suppress writing to /var/log/wtmp.
Call reboot even when shutdown would normally be called.
Shut down network interfaces before reboot.
Suppress normal call to sync.
Suppress normal execution; simply write to /var/log/wtmp.