> It didn't achieve the popularity it sought By what metric? POSIX was never trying to be the universal interface for all kinds of applications, just some san

> It didn't achieve the popularity it sought By what metric? POSIX was never trying to be the universal interface for all kinds of applications, just some sane common interface for UNIX vendors, all of which do implement POSIX to a large extent these days. You could perhaps make the argument that by the time POSIX saw enough adoption, software development evolved and that nowdays there are lots of interfaces that are not part of POSIX/not portable, but that's a slightly different issue.