It would be useful if the readme said what this program actually does.
> mmv - move/copy/append/link multiple files by wildcard patterns
> Rename files ending in .html.en, .html.de, etc. to ending in .en.html, .de.html, etc. in the current directory:
> mmv '*.html.??' '#1.#2#3.html'
[0]: https://github.com/rrthomas/mmv/blob/master/mmv-include.man