What Is UNIX?
UNIX is a computer operating system, a control program that works with users to run programs, manage resources, and communicate with other computer systems. Several people can use a UNIX computer at the same time; hence UNIX is called a multiuser system. Any of these users can also run multiple programs at the same time; hence UNIX is called multitasking. Because UNIX is such a pastiche—a patchwork of development—it's a lot more than just an operating system. UNIX has more than 250 individual commands. These range from simple commands—for copying a file, for example—to the quite complex: those used in high-speed networking, file revision management, and software development.
Most notably, UNIX is a multichoice system. As an example, ...
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