Published at LXer:
Operating systems don[he]#039[/he]t quite date back to the beginning of computing, but they go back far enough. Mainframe customers wrote the first ones in the late 1950s, with operating systems that we[he]#039[/he]d more clearly recognize as such today—including OS/360 from IBM and Unix from Bell Labs—following over the next couple of decades.An operating system performs a wide variety of useful functions in a system, but it[he]#039[/he]s helpful to think of those as falling into three general categories.
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