Usage: /usr/bin/efi-readvar: [-v <var>] [-s <list>[-<entry>]] [-o <file>]
List the contents of the UEFI signature databases

Options:
	-v <var>	list only the contents of <var>
	-s <list>[-<entry>]	list only a given signature list (and optionally
		only a given entry in that list
	-o <file>	output the requested signature lists to <file>