For a lot of people in non-technical professions it might actually be Windows XP.
That is, of course, if we're putting aside some of the basic UNIX tools that probably haven't changed since the 1970s—which I think is fair.
That is, of course, if we're putting aside some of the basic UNIX tools that probably haven't changed since the 1970s—which I think is fair.
(A better example would be the bsdgames collection. It's a lot older and has barely been touched over the years.)
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.