http://oqptm57xf2g6mziwphlf7eqmkdg3ni6qneuuf3wbqzhdfcjufhumaxyd.onion/cvs.1
-n Produces a diff in the same format as that used by rcsdiff(1) , with a count of changed lines on each insert or
delete command. -p With unified and context diffs, show with each change the first 40
characters of the last line before the context beginning with a letter, an
underscore or a dollar sign.