Ultrix (and other) tar formats

[Guy Harris]

> Is the Ultrix tar format identical with the BSD tar format?

One should hope so; if it weren't, Ultrix "tar" would be useless.  Since
Ultrix is a 4.2BSD derivative, the "tar"s are probably the same program
modulo some bug fixes.  However, most UNIXes out there are more-or-less V7
derivatives so *all* their "tar" programs are related and have the same
"tar" format.  (Were that not the case, "tar" would be a lousy way of
exchanging data between machines.)

	Guy Harris