efibootmgr
UEFI boot manager configuration tool
TLDR
List all boot options with their numbers
$ efibootmgr [-u|--unicode]
Add UEFI Shell v2 as a boot option$ sudo efibootmgr -c -d [/dev/sda] -p [1] -l "[\path\to\shell.efi]" -L "[UEFI Shell]"
Add Linux as a boot option$ sudo efibootmgr -c -d [/dev/sda] -p [1] -l "[\vmlinuz]" -u "[kernel_cmdline]" -L "[Linux]"
Change current boot order$ sudo efibootmgr -o [0002,0008,0001,001A]
Delete a boot option$ sudo efibootmgr -b [0008] -B
SYNOPSIS
efibootmgr [options]
DESCRIPTION
efibootmgr manipulates the UEFI Boot Manager by modifying EFI variables stored in NVRAM. It can create, delete, and modify boot entries, change boot order, and set the next boot device.
Essential for managing dual-boot systems and UEFI boot configuration.
PARAMETERS
-c, --create
Create a new boot entry-d, --disk disk
Disk containing the loader-p, --part part
Partition number on the disk-l, --loader name
EFI loader filename-L, --label label
Boot entry label-o, --bootorder order
Set boot order (comma-separated)-b, --bootnum num
Boot entry number to operate on-B, --delete-bootnum
Delete the entry specified by -b-u, --unicode
Pass command line in Unicode
CAVEATS
Requires root privileges. Modifies UEFI NVRAM variables. Use with caution as incorrect settings can prevent system boot. Backup boot entries before making changes.
SEE ALSO
efivar(1), grub-install(8), mokutil(1)