You can make your life a little easier and more productive by adding some Unix power to your Windows system. For a fairly extensive collection of Unix tools ...
Unix was developed as a command line interface in the early 1970s with a very rich command vocabulary. DOS followed more than a decade later for the IBM PC, and DOS commands migrated to Windows.
If you’re rolling up your sleeves and getting your hands dirty with Mac OS X’s Unix underpinnings, you might be interested in a new reference from O’Reilly & Associates called Unix CD Bookshelf, ...