Actualy there are atleast ceople of linux shutdown options. I will explain two simple methods how Linux can be shutdown automatickly at selected time.

1. If you want that computer automatickly shutdown at 23:59 for example. Then in console all this will look like this.

[root@localhost remdex]# at 23:59
at>/sbin/shutdown -h now [Press ctrl+d] 

2. If you want that only tv shutdown but computer still work you can do it like this.

[root@localhost remdex]# at 23:59
at>pkill tvtime
at>xset -display :0.0 dpms force off
at>amixer set Aux mut 


1. First line — kills tvtime
2. Second line — turns off monitor
3. Third line— disabled Aux output, because atleast here then i kill tvtime sound stays.