rcsdiff
Compare RCS revisions (show differences between revisions in RCS files). tldr-pages
On several platforms
Several platforms
Compare the working file with the latest revision
rcsdiff path/to/fileIdentifyCompare the working file with a specific revision
rcsdiff -rrevision path/to/fileIdentifyCompare two specific revisions of a file
rcsdiff -rrevision1 -rrevision2 path/to/fileIdentifyShow differences in unified format
rcsdiff -u path/to/fileIdentifyShow differences with context lines
rcsdiff -c path/to/fileIdentify