rdiff

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rdiff--'patch' format diffs between releases
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   * rdiff [-flags] [-V vn] [-r t|-D d [-r t2|-D d2]] modules...

   * Requires: repository.

   * Changes: nothing.

   * Synonym: patch

   Builds a Larry Wall format patch(1) file between two releases, that
can be fed directly into the patch program to bring an old release
up-to-date with the new release.  (This is one of the few CVS commands
that operates directly from the repository, and doesn't require a prior
checkout.) The diff output is sent to the standard output device.

   You can specify (using the standard `-r' and `-D' options) any
combination of one or two revisions or dates.  If only one revision or
date is specified, the patch file reflects differences between that
revision or date and the current head revisions in the RCS file.

   Note that if the software release affected is contained in more than
one directory, then it may be necessary to specify the `-p' option to
the patch command when patching the old sources, so that patch is able
to find the files that are located in other directories.
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