[IceMichael]

I'm not sure how to read your comment as everything in the script seems to be a comment? Probably format messed up.

What it usually fails at (maybe 4 can do it, I only use 3.5) is that the output should have one line per line-number, so nothing like 9-15 but 9,10,11,12 etc. I made this very explicit, I gave also examples on how the output should look like. Nothing helped.

Also, I explicitly set it should work under macOS but there were many syntax errors or uses of grep that are incompatible with macOS. So maybe part of it would have worked with linux, not sure. If you can maybe reformat, I could check