TL;DR

The cat will find them all.

Scavanging in an old virtual machine, and in particular inside the ~/bin directory I had at the time, I discovered a little utility that might come useful in some vague future. I call it cat-r:

You provide a path (either a directory or a file, but it gives its best with a directory) and it finds all files in that subtree, then prints them out in a way that makes you actually see what stuff is where.