efibootbgr
Manipulate the UEFI Boot Manager (the Bootoptions).
TLDR
List the current settings / bootnums
$ efibootmgr
List the filepaths
$ efibootmgr -v
Add UEFI Shell v2 as a boot option
$ sudo efibootmgr -c -d [/dev/sda1] -l [\EFI\tools\Shell.efi] -L "[UEFI Shell]"
Change the current boot order
$ sudo efibootmgr -o [0002,0008,0001,0005]
Delete a boot option
$ sudo efibootmgr -b [0008] --delete-bootnum
