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UNIX, which does not stand for anything, is a class of powerful operating systems which includes BSD, Linux and Solaris, as well as the original AT&T and USL versions. UNIX is technically a registered trademark which BSD and Linux are not entitled to use, even though they belong to this class of operating systems. The plural of UNIX is Unices, and UNIX is sometimes spelled with only initial caps because it is not an actual abbreviation.
UNIX systems are characterized by stability, wide hardware support, high performance, powerful security and extreme configurability.
Not all operating systems which would normally be considered Unices can be called that legally, in fact most cannot. UNIX is a registered trademark controlled by The Open Group and certification of an operating system to use the UNIX mark is very expensive and of questionable utility, Linux and the BSDs in particular do not take this route, even though the BSDs are actually purer in their genetic and historical "UNIXness" than most "certified" commercial Unices.
Throughout the Vistua Hub, the phrase "UNIX" is used to generically refer to all types of UNIX, even if they are not legally able to be called that, just as everyone refers to all bandages as "Band-Aids" and all health-tissues as "Kleenexes", for the sake of avoiding artificially cumbersome language.
UNIX and in particular the "4.3BSD" UNIX produced at U.C. Berkeley was hugely influential upon the then nascent Internet
Categories: Unix, Software, Internet, Web

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This is an article from the Knowledge Base, a project of the Vistua Online Helpdesk to form a body of articles relating to common system topics. You are welcome to contribute to it.