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GNU GRUB (short for GNU GRand Unified Bootloader, commonly referred to as GRUB) is a boot loader package from the GNU Project.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 ...
A bootloader, for example GNU GRUB, LILO, SYSLINUX or systemd-boot. This is a program that loads the Linux kernel into the computer's main memory, by being executed by the computer when it is turned on and after the firmware initialization is performed. An init program, such as the traditional sysvinit and the newer systemd, OpenRC and Upstart.
From GRUB's perspective, no such partition type exists in case of MBR partitioning. This partition is not required if the system is UEFI-based because no embedding of the second-stage code is needed in that case. [19] [43] [45] UEFI systems can access GPT disks and boot directly from them, which allows Linux to use UEFI boot methods.
A version is also available for Windows 10 and Windows 11 via the Windows Subsystem for Linux. [ 94 ] [ 95 ] It is also the default user shell in Solaris 11. [ 96 ] Bash was also the default shell in BeOS , [ 15 ] and in versions of Apple macOS from 10.3 (originally, the default shell was tcsh ) to 10.15 ( macOS Catalina ), which changed the ...