The Filesystem Hierarchy Standard (FHS) defines the main directories and their contents in Linux operating systems. For the most part, it is a formalization and extension of the traditional BSD filesystem hierarchy.
The FHS is maintained by the Linux Foundation, a non-profit organization consisting of major software and hardware vendors, such as HP, Red Hat, IBM and Dell.
Ok, so anyone can, but do they? Before this is dismissed as an indicator can anyone cite a non-linux or BSD OS that uses this standard maintained by the Linux Foundation?