grub-mkrelpath
make a system path relative to its root
SYNOPSIS
grub-mkrelpath [ OPTION ...] PATH
DESCRIPTION
Transform a system filename into GRUB one.
-?, --help give this help list
--usage give a short usage message
-V , --version print program version
REPORTING BUGS
Report bugs to <bug -grub@gnu.org>.
SEE ALSO
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.