The program compares tokens in two .tex files (or directories, possibly with subdirectories, containing .tex files) and marks differences according to the options set, by using GNU Diff to find tokens to be marked.

Another diff program may be used as well if it has the switches -b, -B, -d, and -E and they have the same effect as with GNU diff.

See also latexdiff.

The author is Bernd Becker.