Efibootmgr

efibootmgr lets you manage the UEFI boot entries written to your NVRAM.

Documentation

man efibootmgr	https://man.archlinux.org/man/core/efibootmgr/efibootmgr.8.en
UEFI spec	specification: UEFI

Example

# show installed bootloaders
#
#  BootOrder: 0080,0000  # boot priority
#  Boot0080:  Mac OS X   # macos boot entry
#  Boot0000:  Foo        # foo boot entry
efibootmgr

efibootmgr -o 0000,0080            # change boot order/priority
efibootmgr -b 0080 -B              # delete a boot entry