USG Unix

operating system /U-S-G yoo'niks/ 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".

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[Jargon File]

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user name User Network Interface user-obsequious user-unctuous Use the Source Luke	AIDX American Telephone and Telegraph, Inc. Berkeley Software Distribution fossil holy wars	usim USL USP USR usr