The program grub-mkrelpath makes a file system path relative to the root of its containing file system. For instance, if /usr is a mount point, then:
$ grub-mkrelpath /usr/share/grub/unicode.pf2‘/share/grub/unicode.pf2’This is mainly used internally by other GRUB utilities such as grub-mkconfig (see Invoking grub-mkconfig), but may occasionally also be useful for debugging.
--helpPrint a summary of the command-line options and exit.
--versionPrint the version number of GRUB and exit.