Ubuntu :: Simple Script As A Launcher?

in a shutdown script that launches when I click an application launcher in one of my panels. I need this because I use scheduled shutdowns and I want to be able to cancel them quickly and easily if need be.It would be nice to somehow change this so I didn't need to enter my password, but I know it uses sudo and this might be too complicated or impossible.I don't really know that much about making scripts. What extension do you save them as, do you have to mark them as executable, etc. I basically started out with the bin bash or whatever deal at the beginning and then just put in that command.