1) some guru out there has probably done a blog post on how to automate things with all of these.
2) I wanted to write something that could help anyone, not only people who are well versed in tech.
But I agree, most of the renaming/sorting/parsing in general, can be done with unix commands.
… in 1982, before the word "blog" even existed - and the advice/instructions still work just fine on any modern vaguely posix/unix-like command shell, including Mac and Windows which also didn't exist when the piece was written.
(Gopher search in "Unix - Utilities - Tutorials - sed and awk - brian kernighan" or dial in to your WELL bbs number and ask for a copy of "sed-awk-tutorial.txt" in the Software conference...)