The historical Unix from Bell Labs in the 1970s and 1980s, as opposed to Unix variants and clones from other vendors. This tag is only about the historical product known as UNIX Time-Sharing System or UNIX System III/IV/V. For the history of the Unix family of operating systems in general, use the "history" tag.

Unix started out around 1969 as an operating system for minicomputers at AT&T Bell Labs. AT&T first licensed it to educational institutions, then to commercial users.

Over the years, many companies and institutions made their own version of Unix, either by adapting AT&T code or by writing replacements with the same interfaces: , Xenix/, /, , , , NextSTEP, , , ...

This tag is only about the historical product known as UNIX Time-Sharing System or UNIX System III/IV/V. For the history of the Unix family of operating systems in general, use the tag .

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