After GRUB gains control of the system, a menu is displayed on the console. In the GRUB menu, you can do the following:
Select an entry to boot your system
Modify a boot entry by using the built-in GRUB edit menu
Manually load an OS kernel from the command line
A configurable timeout is available to boot the default OS entry. Pressing any key aborts the default OS entry boot.
To view an example of a GRUB menu, see Description of the GRUB Main Menu.