make a system path relative to its root
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 -email@example.com>.
grub-probe(8) The full documentation for grub-mkrelpath is maintained as a Texinfo manual. If the info and grub-mkrelpath programs are properly installed at your site, the command info grub-mkrelpath should give you access to the complete manual.