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tkdiff is a graphical diff viewer based on the Tk framework.[1] It is capable of inter-operating with source-control systems like CVS and Subversion to show the differences between the local copy and the repository version. Such a line-by-line comparison is often considered to be good software engineering practice before committing code changes.
Tkdiff highlight specific differences within a line shared by both files, rather than simply indicating that the whole line differs.