I'm probably biased, but Solaris' role-based access control system has been very successful among its particular customer base: https://docs.oracle.com/cd/E238

I'm probably biased, but Solaris' role-based access control system has been very successful among its particular customer base: https://docs.oracle.com/cd/E23824_01/html/821-1456/rbac-1.html https://docs.oracle.com/cd/E23824_01/html/821-1456/rbac-1.ht... It wasn't necessary to throw away POSIX history or concerns either.