[TUHS] history of sbin?

I have heard the story a few times about sbin split is due to disk space, such as told at http://www.osnews.com/story/25556/Understanding_the_bin_sbin_usr_bin_usr_sb… http://lists.busybox.net/pipermail/busybox/2010-December/074114.html But I don't see any mention of it in 32V and not in BSD until around Net2 (like in 1991 src.README said ``... there has been a major reorganization of the file system. (You may have seen similar reorganizations on systems shipped by Sun Microsytems [sic] and Digital Equipment Corporation, among others.) ... /sbin same as /bin, but binaries for the root user''. The slides from Feb. 1988 for a BSD BOF at USENIX mentioned this sbin reorganization. Looking at "Unix Text Processing" (1987) and "Life with Unix" (1989) I didn't see any use of sbin/. (I didn't look at my other old books.) /usr/brl/sbin/...). When did some (non-BSD) systems ship and document /sbin, /usr/sbin? Is the common story (liked linked above) the right story? Jeremy C. Reed echo uggc://errqzrqvn.arg/obbxf/ofq-uvfgbel/ | \ tr "noqruvxzabcefgl" "abdehikmnoprsty"