Answer:
There are alot of commands for cmd...
Theres ones that wipe your hardrive, make you an admin or simply shutdown.
I only know the shutdown one off by heart, you can even make it time down and have a comment - here it is
shutdown -s -t 90 -c "your message here!"
Shutdown = shutdown.
-s = Shutdown - can also be changes to -r for restart.
-t + put in your time limit
-c " " = comment " "
Hope it helps! If you want more for "shutdown" go on cmd and type in shutdown
this will come up with lots of options to help!
Or just type in help in there and you get loads of help!