grub

TLDR

Enter GRUB shell

$ sudo grub

Install GRUB to disk

$ sudo grub-install /dev/sda

Update GRUB configuration

$ sudo update-grub

Generate config file

$ sudo grub-mkconfig -o /boot/grub/grub.cfg

Check GRUB version

$ grub-install --version

SYNOPSIS

grub [options]
grub-install [options] device

GRUB (GRand Unified Bootloader) is the standard bootloader for Linux systems. It loads the kernel and initrd, presenting a boot menu for system selection.
GRUB 2 supports multiple filesystems, LVM, RAID, and encrypted partitions. It provides rescue mode for system recovery and scripting for advanced configurations.
GRUB boots operating systems.

PARAMETERS

--root-directory DIR

Install to alternate root.

--boot-directory DIR

Boot directory location.

--target TARGET

Target platform.

--recheck

Probe devices again.

--removable

Install for removable media.

--help

Display help information.

CAVEATS

Misconfiguration can prevent booting. Keep rescue media available. GRUB 2 differs from legacy GRUB.

HISTORY

GRUB was created as part of the GNU Project. GRUB 2 was released in 2002 as a complete rewrite with enhanced features.