Thanks, didn't mean it as a GNU thing at all. Sure, mkdir would've existed back in research Unix too. My experience has only been limited to the Linux envs, which is why I was led to attribute mkdir to the evolution in mknod(), I only know that they all either descended down from SysV or BSD, those who have used the real Unices would know better. Seeing as I haven't had the privilege of using any except briefly on an emulator.