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 <w...@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. > _______________________________________________ > macports-users mailing list > macports-users@lists.macosforge.org > https://lists.macosforge.org/mailman/listinfo/macports-users >
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