Requires: repository, working directory.
Run an external diff defined by the cvswrappers file on the server. The output and options for this option vary depending on what is run on the server-side diff, however the common options are listed below.
Diff revision for date against working file. Specifying the -D option twice causes the diff to be against the two dated revisions instead of the working file.
Also diff added and removed files.
Process directories recursively.
Process local directory only.
Pass extra arguments and options to the external xdiff program.
Diff revision or tag against working file. Specifying a second -r option causes the diff to be against two specified revisions instead of the working file.