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USG Unix /U-S-G yoo'niks/ n.,obs.

Refers to AT&T Unix commercial versions after Version 7, especially System III and System V releases 1, 2, and 3. So called because during most of the lifespan of those versions AT&T's support crew was called the `Unix Support Group', but it is applied to version that pre- and post-dated the USG group but were of the same lineage. This term is now historical. See BSD, Unix.

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