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[utzoo!decvax!ucbvax!unix-wizards]

>From decvax!yale-comix!jre at Berkeley Thu Sep 24 15:17:30 1981
There is a much better algorithm for comparing files that is not
only linear time/space, but also outputs differences in a way
superior to DIFF.  See "A Technique for Isolating Differences Between
Files" by Paul Heckel, CACM April 1978.  A good C programmer can
implement the algorithm in a day.  There are very successful versions
running on TOPS-20 and the Apollo.

	--John R. Ellis