So I was installing python3, pip, and a few other applications through Homebrew when I first got my Mac. I realized I was doing all this in /usr/bin and not /usr/local/bin, and I wanted to just to back to what was originally in /usr/bin. Nothing more, nothing less. I re-installed the OS (from my local disk and also the internet) and I still have my "python3" and "pip3" applications within /usr/bin.
I think I also removed emacs, so when I type
which emacs I get
emacs not found. I believe OS X comes with a native version of emacs that I also seem to have lost.
Any advice on how to get all the original contents of /usr/bin back, and remove what I've added?