Note: help and version output are generated by a naïve script which tries a few variants of
<command> --help, <command> -h etc. to find the command's help and version info.
Sometimes it gets lucky, sometimes it doesn't; if the output below looks wrong, it probably is.
musixflx -V (return code: 3)
Musixflx-0.83.3.lua7
File not found: --version.mx1
musixflx (return code: 3)
Musixflx-0.83.3.lua7
Usage: [texlua] musixflx.lua basename[.tex | .mx1] [ d | m | f | s ]