Operating system since 1969

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Possible Answers: UNIX.

Random information on the term “UNIX”:
Unix (officially trademarked as UNIX) is a multitasking, multi-user computer operating system that exists in many variants. The original Unix was developed at AT&T’s Bell Labs research center by Ken Thompson, Dennis Ritchie, and others.[1] From the power user’s or programmer’s perspective, Unix systems are characterized by a modular design that is sometimes called the Unix philosophy, meaning that OS provides a set of simple tools that each perform a limited, well-defined function,[2] with a unified filesystem as the main means of communication[1] and a shell scripting and command language to combine the tools to perform complex workflows.
Taken from Wikipedia

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