Additional information such as the page's author and timestamps will be shown on the right side of the page.GRUB 2 is the latest version of GNU GRUB, the GRand Unified Bootloader.For upgrades of BIOS systems the default is also to install GRUB 2, but you can opt to skip bootloader configuration entirely.
A bootloader is the first software program that runs when a computer starts.
It is responsible for loading and transferring control to the operating system kernel, (Linux, in the case of Fedora).
That might however not work so well, especially not for booting other Linux operating systems, and especially not on UEFI systems. Note If GRUB_SAVEDEFAULT is set to true, then, when an entry is selected, save it as a new default entry for use by future runs of GRUB.
So, maybe, you need be sure that GRUB_SAVEDEFAULT is not set to true.
GRUB_SAVEDEFAULT is only useful if GRUB_DEFAULT is saved.
Note The above method fails to work on some F20 (and newer) systems due to a missing or improperly linked /boot/grub2/grubenv file.
To fix this, change /boot/grub2/grubenv to point to ../efi/EFI/fedora/grubenv instead and your chosen default OS will boot without any problems.
Note There are other, simpler, ways of setting the default entry, but they are prone to error if/when grub2-mkconfig is re-run.
grub2-install will install the bootloader - usually in the MBR, in free unpartioned space, and as files in /boot.
The bootloader is installed with something like: grub2-mkconfig will create a new configuration based on the currently running system, what is found in /boot, what is set in /etc/default/grub, and the customizable scripts in /etc/grub.d/ .
Grubby in Fedora patches the configuration when a kernel update is performed and will try to not make any other changes than what is necessary.