Hi, I need some guidelines to start coding a shell script that will provide the administrator with the shutdown options :
-shutdown -now shutdown -h ?
-shutdown [time] , which i have no clue how to use a variable so the user can manually select a time to shutdown.
-shutdown (in minutes) , i know shutdown -t is for secs but what about minutes?

also, do i need to use a loop for this options? for example the user accidentally press the option 2 which is the shutdown time and he wanted to use option 1 instead.

Thanks in advance

sam