SHUTDOWN/REBOOT in linux

Basic command to shutdown/reboot the system in terminal mode

To shutdown your system

shutdown -h now "message"

This command will shutdown the system.The message can be any message you want send when shutdown/reboot.If you want to shutdown the system for a specific time,then use

shutdown -h hh:mm "message"

Here hh is hours and mm is minutes.

To reboot

shutdown -r now "message"

To reboot the system for automated specific time then,

shutdown -r hh:mm "message"