fmn:~ # shim-install --help
Usage: shim-install [OPTION] [INSTALL_DEVICE]

Install Secure Boot Loaders on your drive.\n

--directory=DIR use images from DIR.\n
--grub-probe=FILE use FILE as grub-probe.\n
--removable the installation device is removable.\n
--bootloader-id=ID the ID of bootloader.\n
--efi-directory=DIR use DIR as the EFI System Partition root.\n
--config-file=FILE use FILE as config file, default is /boot/grub2/grub.cfg.\n
--clean remove all installed files and configs.\n

INSTALL_DEVICE must be system device filename.\n