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.KeywordsHard DriveLogical BlockDomain Name SystemHome DirectoryComputer Science StudentThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.