Irix and OS X are POSIX systems because they are fully-POSIX-compliant. However, operating systems like FreeBSD, Haiku, and GNU/Linux, for example, are "mostly-POSIX-compliant". Can people still correctly refer to such systems as POSIX systems?


No. The Open Group has an actual POSIX certification process, so if an operating system hasn't been through that, it cannot be referred to as POSIX-compliant.

  • 5
    Of course, this won't stop people from referring to them as such, and it's still a useful handle. – evilsoup Dec 29 '13 at 21:07

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