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## Merging differences between any two revisions

With two ``-j revision'` flags, the `update` (and `checkout`) command can merge the differences between any two revisions into your working file.

    $ cvs update -j 1.5 -j 1.3 backend.c

will remove all changes made between revision 1.3 and 1.5. Note the order of the revisions!

If you try to use this option when operating on multiple files, remember that the numeric revisions will probably be very different between the various files that make up a module. You almost always use symbolic tags rather than revision numbers when operating on multiple files.

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