BSD, Linux, and Mac OS X are clearly branches straight from a single tap root: the UNIX operating system. As you learned in Chapter 1, UNIX rose to meet many new computing challenges in the 1970s, and matured at a dizzying pace in the 1980s. BSD was the result of the work of computer science students at UCB. Linux was the creation of a Finnish computer science student in Sweden. Mac OS X took critical elements of BSD-FreeBSD in particular-and rolled them into yet another powerful and groundbreaking operating system. In their own way, all three moved computing into new and previously unknown realms.
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