Shutdown and reboot the system.
-r, --reboot
Reboot immediately
shutdown {{[-r|--reboot]}} now
Power off ([h]alt) immediately
shutdown -h now
shutdown [-r|--reboot] now
Reboot in 5 minutes
shutdown [-r|--reboot] +5 &
Shutdown at 1:00 pm (Uses 24h clock)
shutdown -h 13:00
[c]ancel a pending shutdown/reboot operation
shutdown -c