Beneath the easy-to-use interface of Mac OS X is a robust and complete UNIX operating system called Darwin. Darwin is based on open technologies such as FreeBSD, Mach, Apache, and GCC. It comes with hundreds of powerful UNIX applications already installed.

You access the UNIX operating system in Mac OS X by using the Terminal application. Terminal is in the /Applications/Utilities folder.

For more information on using Terminal, see Terminal Help.

For more information on UNIX in Mac OS X, see the Apple UNIX website.

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Apple UNIX website