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RedHat 9 (Linux i386) - man page for vimdiff (redhat section 1)

VIMDIFF(1)						      General Commands Manual							VIMDIFF(1)

vimdiff - edit two or three versions of a file with Vim and show differences
vimdiff [options] file1 file2 [file3] gvimdiff
Vimdiff starts Vim on two (or three) files. Each file gets its own window. The differences between the files are highlighted. This is a nice way to inspect changes and to move changes from one version to another version of the same file. See vim(1) for details about Vim itself. When started as gvimdiff the GUI will be started, if available. In each window the 'diff' option will be set, which causes the differences to be highlighted. The 'wrap' and 'scrollbind' options are set to make the text look good. The 'foldmethod' option is set to "diff", which puts ranges of lines without changes in a fold. 'foldcolumn' is set to two to make it easy to spot the folds and open or close them.
Vertical splits are used to align the lines, as if the "-O" argument was used. To use horizontal splits intead, use the "-o" argument. For all other arguments see vim(1).
Most of Vim was made by Bram Moolenaar, with a lot of help from others. See ":help credits" in Vim. 2001 March 30 VIMDIFF(1)