On mac osx terminal, I installed many terminal programs while trying to install a programming library. Now I'm wondering how I delete them. I think some of them include pip, macports, vmenven (or something). I'm not sure what these programs are called but they all are called from the command line using something like "macports..." (so I'm calling them terminal programs). First, how do I tell what terminal programs are installed. Second, how do I delete them. And, to be through, where are the programs stored anyway?