Originally Posted by jailbait
"can the system wake up from hibernation or sleep?"
Yes. Have cron issue this command at the required time:
shutdown -r now
The system will shut down and restart.
I see. Thank you. I did not understand your answer before. But I am still a little confused.
If ran the command 'shutdown -t now -r 05:20', the system would shutdown and reboot at 05:20? Or does the system have to put into hibernation and this command added to cron?
BTW, what's the command to put a system into hibernation mode?