And how do I add it to my path? 25 years ago, I would have edited the .cshrc file to add it, but I have no idea what file I would edit in OS X to accomplish this.
I think the Mac "Terminal" uses bash by default, and you can edit ~/.bashrc to customize it.
I'll confess that my own setup is quite old (and I use X and Xterms most of the time), so I don't really remember how it was originally.
Everyone seems to use bash ("Bourne Again SHell", since normal "sh" (since v7 unix) was apparently more correctly "the Bourne Shell.") Personally I prefer csh or tcsh, but I got tired of "swimming upstream." My macos seems to include those other shells as well, so you can probably change things to your liking, if you have one. (does anyone actually write their own shell .init file any more? Mine was copied from my boss when I switched from csh to bash, and half the stuff is from solaris or linux and I don't really understand what it does...)