So you’ve connected to a linux box, or you’re poking around on OSX, and wondering what the heck /usr, /bin, /etc, /lib and so on are all about. Take a look at the File System Hierarchy site and enlighten yourself. After you’re done you still may find yourself wishing the directory names were more descriptive, but at least you’ll have a better sense of how they’re intended to work, where to find things, and where to install things to.