s the only operating system in existence was DOS. Bill Gates bought DOS for $50,000 in 1991 from a local computer hacker who was from Seattle Washington. After DOS came a competitor called the UNIX operating system. The problem with UNIX was that it was over priced. The Unix code was once taught in college and now it was kept hidden and secure to ensure that no one "steal" it. MINIX was the next species of operating system, which Linux is based upon today. A Dutch college professor named Andrew S Tanenbaum wrote Minix with the idea to show his students the core of a real Operating System. Although it was not the greatest OS, Minix had a big advantage over all the rest, which was that the code was open source. Anyone who bought Prof Tanenbaum's textbook could see his 12,000 lines of code that ran Minix. Prior to Minix, all OS code was heavily guarded and kept
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