Linux

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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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OS market share in Top 500 supercomputers (feddit.org)

submitted 1 month ago* (last edited 1 month ago) by [email protected] to c/[email protected]

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Source: https://en.wikipedia.org/wiki/Supercomputer_operating_system
Author: https://commons.m.wikimedia.org/wiki/User:Benedikt.Seidl
Data from: http://top500.org/stats

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[–] [email protected] 40 points 1 month ago (2 children)

Unix is basically a brand name.
BSD had to be completely re-written to remove all Unix code, so it could be published under a free license.
It isn't Unix certified.

So it is Unix-derived, but not currently a Unix system (which is a completely meaningless term anyway).

[–] [email protected] 4 points 1 month ago (2 children)

But OS X, macOS, and at least one Linux distro are/were UNIX certified.

[–] [email protected] 4 points 1 month ago (1 children)

Yup. It is all about paying the price, Microsoft could technically get Windows certified as UNIX. IBM did just that with its mainframe OS. Here's a list of certified UNIX systems: https://www.opengroup.org/openbrand/register/

[–] [email protected] 5 points 1 month ago

Microsoft could technically get Windows certified as UNIX.

I don't think they could now that the POSIX subsystem and Windows Services for UNIX are both gone. Don't you need at least some level of POSIX compliance (at least the parts where POSIX and Unix standards overlap) to get Unix certified?

[–] dustyData 2 points 1 month ago

It means nothing, it's just a paycheck you sign and then you get to say "I certify my OS is Unix". The little bit more technical part is POSIX compliance but modern OSs are such massive and complex beasts today that those compliances are tiny parts and very slowly but very surely becoming irrelevant over time.

Apple made OSX Unix certified because it was cheap and it got them off the hook from a lawsuit. That's it.

[–] arden 3 points 1 month ago

macos is unix certified tho