is a powerful operating system originally developed by AT&T for use on minicomputers but now runs on workstations, servers, and mainframe computers.

Unix operating system.

Explanation:

In the late 1960s as a result of efforts to create a time sharing computer system, Unix operating system was developed by AT&T corporations; Bell Laboratories.

The main features of the unix is the ability to run on many different system. unix is widely used for internet servers , work stations and mainframe computers.

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