Let’s return to previous section of my answer. Example: "Hewlett Packard Enterprise: HP-UX 11i V3 Release B.11.31 or later on HP 9000 Servers with Precision Architecture" (from the register page). has entered into a Trademark License Agreement with X/Open Company Limited." Side note: I hesitate to question what it would means for macOS 10.13 on non-Intel hardware to be treated as, but considering that hardware is mentioned for other OS, the hardware is significant. In a very specific definition, macOS version 10.13 High Sierra on Intel-based hardware is compliant to the UNIX 03 standard and to quote the pdf certificate, "Apple Inc. Where does macOS X stand in the *nix world ? Based on the above sources, it seems UNIX nowadays is not that specific OS, but rather a standard derived out of the best possible generalization for how operating systems in Unix family behave. Please note that this does not mention the presence of any traces of the original Unix source code, nor does it mention the kernel in any way (this will become important later).Īs for the AT&T and System V Unix developed by Ritchie and Thompson, nowadays we can say it has ceased to exist. So what this suggests (or at least so is my interpretation), is that when an OS conforms to the POSIX standard and Single UNIX Specifications, it is compatible in behavior with Unix as an OS that once existed at one point in time in history.
To address this, vendors and users joined together in the 1980s to create the POSIX® standard and later the Single UNIX Specification. The success of the UNIX approach led to a large number of “look-alike” operating systems, often divergent in compatibility and interoperability. To quote the About Us page with my own emphasis in bold:
Curiously enough the latest standard listed on their website is UNIX 03, and to quote another source, "UNIX® 03 - the mark for systems conforming to version 3 of the Single UNIX Specification". The latest version of the certification standard is UNIX V7, aligned with the Single UNIX Specification VersEditionĭetails of those specs can be found here. The same page specifically states which specification defines UNIX: "UNIX®, an open standard owned and managed by The Open Group, is an enabler of key technologies and delivers reduced total cost of ownership, increased IT agility, stability, and interoperability in hetero¬geneous environments enabling business and market innovation across the globe." Short answer: UNIX is a specification/standard nowadays.Īt the time of writing, to quote the official sources, "UNIX® is a registered trademark of The Open Group", the company which among many things provides UNIX certification:
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