Nice find! Man page footer on current OS X says 1997-03-25. I looked at some other man pages from ls, cat, tar and the like and the oldest that I found was rm,

Nice find! Man page footer on current OS X says 1997-03-25. I looked at some other man pages from ls, cat, tar and the like and the oldest that I found was rm, from January 28, 1999. UPDATE! rmdir's man page is from May 31, 1993! Though I'm sure the actual code was updated since then.