UNIX

Os seguintes sistemas operativos são variações do UNIX

Nota: O facto de os seguintes textos estarem em inglês, deve-se ao facto de se salvaguardar a originalidade das afirmações feitas pelos autores.

“Unix was originally developed by AT&T. They shared their source with the University of California at Berkeley. BSD (Berkeley Standard Distribution) is the Unix that evolved at UC-Berkeley. Note that the xBSD (FreeBSD, OpenBSD, NetBSD) distributions are all free of any AT&T code. AT&T continued development of its Unix for a while, and that finished with System V. Several years ago, the various Unix vendors (AT&T, Sun, HP, and others) pledged to bridge the incompatibilities between their versions. This is what System V Release 4 (SVR4) refers to the ‘standard’ that they created.” — Mukesh Agrawal

“Unix is a trademark that was transferred by Novell Unixware (the result of Novell’s purchase of AT&T Bell Lab’s Unix group) to the non-profit X/Open Company, Ltd, and is now apparently owned by ‘The Open Group’ (the result of a merger between X/Open and OSF). To get their permission to call a product ‘Unix’, The Open Group requires one to pass a number of validation suites that check conformance of APIs, commands and utilities, and the C compiler.” — Steve Byan

“Also unless an operating system has officially passed the X/OPEN UNIX branding, it can not be considered a UNIX. It can only be considered to be UNIX like or compatible. Because UNIX is a registered trademark of X/OPEN, this is a legal issue. In trademark law, the owner of a trademark must prosecute any known generic use of their trademark or they can lose their trademark. I know it seems petty, but that is the way the U.S. legal system works.” — John Malmberg

“If you’re a UNIX user, all UNIX are pretty much the same. If you’re a UNIX programmer, all UNIX are a little bit different. If you’re a UNIX system admin, all UNIX are completely different! That’s comming from ULTRIX, AIX, HP-UX, Solaris, and Digital UNIX experiences. Might as well count linux, too.” —Bob Koehler, Hubble Space Telescope Payload Flight Software Team

“As UNIX evolves into a 64-bit operating system, AIX 4.3 and Digital UNIX 4.0d share the lead for delivering commercial UNIX functions.” —D.H. Brown Associates

“The “holy war” of computing these days — Microsoft’s Windows NT Server vs. UNIX — is, strangely enough, being upstaged by a johnny-come-lately called Linux. And while UNIX-clone Linux’s emerging popularity gives small businesses another attractive alternative when plotting their network operating system (NOS) strategies, it also adds confusion to an already muddled issue.” — Jim Carr

Site oficial

http://www.opengroup.org/testing/checklist/u98brand.html

FAQs

(Frequently Asked Questions)

http://www.unix-vs-nt.org/