grub
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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 operating system's partitions. [0]

Upstream: https://www.gnu.org/software/grub/


[000] Index
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* Installation ........................................................... [001]
* Setup .................................................................. [002]
* Usage .................................................................. [003]
* References ............................................................. [004]


[001] Installation
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+------------------------------------------------------------------------------+
|                                                                              |
|  $ kiss b grub                                                               |
|                                                                              |
+------------------------------------------------------------------------------+

If using UEFI, efibootmgr is also required.

+------------------------------------------------------------------------------+
|                                                                              |
|  $ kiss b efibootmgr                                                         |
|                                                                              |
+------------------------------------------------------------------------------+


[002] Setup
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Ensure that all required partitions are mounted.


--[003] BIOS -------------------------------------------------------------------

  Replace '/dev/sdX' with the disk (not partition) where Grub will be installed.

  +----------------------------------------------------------------------------+
  |                                                                            |
  |  $ grub-install --target=i386-pc /dev/sdX                                  |
  |  $ grub-mkconfig -o /boot/grub/grub.cfg                                    |
  |                                                                            |
  +----------------------------------------------------------------------------+


--[004] EUFI -------------------------------------------------------------------

  Replace 'esp' with the EFI mount point (typically /boot).

  +----------------------------------------------------------------------------+
  |                                                                            |
  |  $ grub-install --target=x86_64-efi \                                      |
  |                 --efi-directory=esp \                                      |
  |                 --bootloader-id=GRUB                                       |
  |  $ grub-mkconfig -o /boot/grub/grub.cfg                                    |
  |                                                                            |
  +----------------------------------------------------------------------------+


[003] Usage
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Refer to the manual pages and command help output.


[004] References
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[0] https://en.wikipedia.org/wiki/GNU_GRUB