Darwin Version

Richard L. Hamilton rlhamil at smart.net
Tue Oct 6 08:41:58 PDT 2015

Unix was originally a name for an operating system, and unofficially for a code lineage of variants derived from it.

It is now a trademark that can be granted to any OS meeting the current Single Unix Specification testing, and where the OS owner has paid for permission to use the trademark.

https://en.wikipedia.org/wiki/Single_UNIX_Specification <https://en.wikipedia.org/wiki/Single_UNIX_Specification>

According to that, no Linux implementation has been formally put through the tests.  (presumably possible if the $$ were spent, although possibly not without some changes)

At least one of the OS's listed (z/OS) as qualified for the Unix trademark, is something else entirely in origin, but has had compatibility features added to achieve compliance, although MVS (predecessor of z/OS) lineage mainframe software that is not remotely written for a Unix OS still exists and can still be developed too.

Perhaps more commonly, mainframes running the virtualization host OS z/VM can host many Linux guest VMs.

> On Oct 6, 2015, at 05:16, Bachsau <web at bachsau.name> wrote:
> Dominik Reichardt wrote on 06.10.2015 11:10:
>> While it is off topic, why the need to be so rude?
> I'm not rude, just asking. :)
> There is always many discussion about what is a real UNIX, if something was derived or rewritten, if Linux is UNIX and so on... I just don't get what's the reason for these discussions? Just out of personal interest or because people think some systems are "better" than others because of history? For me, it doesn't really matter. There are System which conform to the POSIX standards and those that don't. Some of them being free software, others are not. And I think that are the only important differences.
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> macports-users at lists.macosforge.org
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