The current edition of POSIX is from 2013: <a href="http:&#x2F;&#x2F;pubs.opengroup.org&#x2F;onlinepubs&#x2F;9699919799&#x2F;" rel="nofollow">http:&#x2F;&#x2F;pubs.opengroup.org&#x2F;onlinepubs&#x2F;9699919799&#x2F;</a>