Bash does seem like a better fit for this kind of script since it is a lot more portable.

I.e.: It comes by default for many Linux distributions. For windows, a Git bash install will get you most utilities needed for large reliable scripts (grep, scp, find, sort, uniq, cat, tr, ls, etc.).

With that said, you should write it on whatever language you want, especially if it is for learning purposes, that’s where the fun comes from :)