If you have installed Linux (any format) onto your machine, either standalone or as part of a dual boot system, you would have seen the GRUB menu pop up. This screen usually appears when you start your machine and offers you a choice of operating system to install.
Sometimes, you may want to hide this menu (ie, go straight to the login screen) or show it if it is hidden or change the amount of time it stays up.
This article shows you how to change the above parameters. While you can use packages such as "start up manager" to do your changes, I wanted to edit the configuration files manually just so that we can get a bit of practice on how to use the terminal window and editing text files :)