Cute, but most of the history is wrong. The distinction between /bin and /usr/bin is true - / held the things need to boot the system. Other things were on /usr. The Berkeley guys did NOT invent shared libraries. Shared libraries as we know them came originally from Sun, on SunOS 4.x for sure, possibly on SunOS 3.x. (Larry?) Many commercial vendors adopted the design (Ultrix, I think, and maybe others) and finally around 4.4 they found their way into "pure" BSD. /home and /opt came into the picture circa 1989 with SVR4 when Berkeley, AT&T and Sun (and maybe a few others?) got together to standardize the layout and make diskless booting possbile and reasonable with NFS sharing of home directories. /sbin & /usr/sbin came into the picture at this point also, to hold executables that until then had lived in /etc. The idea was that /etc should only have per-machine configuration files. The general point of the article and of some of the postings, that the proliferation doesn't make a lot of sense today, is well taken. The Bell Labs guys themselves recognized this when they did Plan 9. The problem is even worse on 64 bit Linux systems, which can handle two different architectures. /lib and /lib64 confuse a lot of the older 'configure' programs. Personally, I hate reading articles by "experts" where 85% of the facts are wrong. I lived through all of it, and I know better... :-) Arnold