Terry Reedy writes:
What I remember from 26 years ago is 'ls -a'. Still correct in a console? (No idea how to do the same on GUIs.) This was part of any Unix intro as one was expected to edit the shell configs to one's taste.
Yes, "ls -a" (or "ls -A", which omits "." and ".."). This applies to Mac OS X as well, and as of Yosemite I can't find any way to show hidden files in the Finder. (But there may be a way: I use Mac OS X because it's pretty and I can use traditional *nix commands in the terminal, not because I'm a Mac GUI wonk.)