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oreilly_-_learning_the_unix_operating_system
An operating system (or "OS") is a set of programs that controls a computer. It controls both the
hardware (things you can touch - such as keyboards, displays, and disk drives) and the software
(application programs that you run, such as a word processor).
Some computers have a single-user OS, which means only one person can use the computer at a time.
Many older OSes (like DOS) can also do only one job at a time. But almost any computer can do a lot
more if it has a multiuser, multitasking operating system like UNIX. These powerful OSes let many
people use the computer at the same time and let each user run several jobs at once. |
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