[files...] diff [ kl] [rcsdiff_options] [[ r rev1 | -D date1] [ r rev2 | -D date2]]

Changes: nothing.

You can compare your working files with revisions in the source repository, with the 'cvs diff' command. If you don't specify a particular revision, your files are compared with the revisions they were based on. You can also use the standard cvs command option -r to specify a particular revision to compare your files with. Finally, if you use -r twice, you can see differences between two revisions in the repository. You can also specify -D options to diff against a revision in the past. The -r and -D options can be mixed together with at most two options ever specified.

See rcsdiff(1) for a list of other accepted options.

If you don't specify any files, diff will display differences for all those files in the current directory (and its subdirectories, unless you use the standard option -l) that differ from the corresponding revision in the source repository (i.e. files that you have changed), or that differ from the revision specified.