grub-mkrelpath --version (return code: 0)
grub-mkrelpath (GRUB) 2.02~beta2-36ubuntu3.7
grub-mkrelpath --help (return code: 0)
Usage: grub-mkrelpath [OPTION...] PATH
Transform a system filename into GRUB one.
-?, --help give this help list
--usage give a short usage message
-V, --version print program version
Report bugs to <bug-grub@gnu.org>.