10 Facts About GNU GRUB

GNU GRUB is a boot loader package from the GNU Project.

GNU GRUB is the reference implementation of the Free Software Foundation's Multiboot Specification, which provides a user the choice to boot one of multiple operating systems installed on a computer or select a specific kernel configuration available on a particular operating system's partitions.

GNU GRUB was developed from a package called the Grand Unified Bootloader .

GNU GRUB uses the second approach, by understanding the underlying file systems.

GNU GRUB 2 was written from scratch and intended to replace its predecessor, and is used by a majority of Linux distributions.

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GNU GRUB can be configured to automatically load a specified OS after a user-defined timeout.

Alternatively, GNU GRUB can pass control of the boot process to another boot loader, using chain loading.

GNU GRUB is free and open-source software, so several variants have been created.

StartUp-Manager and GNU GRUB Customizer are graphical configuration editors for Debian-based distributions.

Strength of GNU GRUB is the wide range of supported platforms, file systems, and operating systems, making it the default choice for distributions and embedded systems.