efibootmgr — Manipulate the UEFI Boot Manager. More information: <https://manned.org/efibootmgr>.

List all boot options with their numbers

efibootmgr {{[-u|--unicode]}}

Add UEFI Shell v2 as a boot option

sudo efibootmgr {{[-c|--create]}} {{[-d|--disk]}} {{/dev/sda}} {{[-p|--part]}} {{1}} {{[-l|--loader]}} "{{\path\to\shell.efi}}" {{[-L|--label]}} "{{UEFI Shell}}"

Add Linux as a boot option

sudo efibootmgr {{[-c|--create]}} {{[-d|--disk]}} {{/dev/sda}} {{[-p|--part]}} {{1}} {{[-l|--loader]}} "{{\vmlinuz}}" {{[-u|--unicode]}} "{{kernel_cmdline}}" {{[-L|--label]}} "{{Linux}}"

Change the current boot order

sudo efibootmgr {{[-o|--bootorder]}} {{0002,0008,0001,001A,...}}

Delete a boot option

sudo efibootmgr {{[-b|--bootnum]}} {{0008}} {{[-B|--delete-bootnum]}}