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INTERDIFF(1)									     INTERDIFF(1)

       interdiff - show differences between two diff files

       interdiff [-p n] [-U n] [-d PAT] [-Bbiqwz]
		 [--interpolate | --combine] [--no-revert-omitted]
		 diff1 diff2

       interdiff {--help | --version}

       interdiff  creates  a unified format diff that expresses the difference between two diffs.
       The diffs must both be relative to the same files. For best results, the diffs  must  have
       at least three lines of context.

       To reverse a patch, use /dev/null for diff2.

       To reduce the amount of context in a patch, use:

	      interdiff -U1 /dev/null patchfile

       Since  interdiff doesn't have the advantage of being able to look at the files that are to
       be modified, it has stricter requirements on the input format than patch(1) does. The out-
       put of GNU diff will be okay, even with extensions, but if you intend to use a hand-edited
       patch it might be wise to clean up the offsets and counts using recountdiff(1) first.

       The diffs may be in context format. The output, however, will be in unified format.

       -h     Ignored, for compatibility with older versions of interdiff. This  option  will  go
	      away soon.

       -p n   When comparing filenames, ignore the first n pathname components from both patches.
	      (This is similar to the -p option to GNU patch(1).)

       -q     Quieter output. Don't emit rationale lines at the beginning of each patch.

       -U n   Attempt to display n lines of context (requires at least n lines of context in both
	      input files). (This is similar to the -U option to GNU diff(1).)

       -d pattern
	      Don't  display  any  context  on	files that match the shell wildcard pattern. This
	      option can be given multiple times.

	      Note that the interpretation of the shell wildcard pattern  does	not  count  slash
	      characters  or  periods as special (in other words, no flags are given to fnmatch).
	      This is so that ``*/basename''-type patterns can be given without limiting the num-
	      ber of pathname components.

       -i     Consider upper- and lower-case to be the same.

       -w     Ignore whitespace changes in patches.

       -b     Ignore changes in the amount of whitespace.

       -B     Ignore changes whose lines are all blank.

       -z     Decompress files with extensions .gz and .bz2.

	      Run as ``interdiff''. This is the default.

	      Run  as  ``combinediff''. See combinediff(1) for more information about how the be-
	      haviour is altered in this mode.

	      (For interpolation mode only) When a file is changed by the first patch but not  by
	      the second, don't revert that change.

       --help Display a short usage message.

	      Display the version number of interdiff.

       Basic usage:

	      interdiff -z 3.2pre1.patch.gz 3.2pre2.patch.gz

       Reversing a patch:

	      interdiff patch /dev/null

       Reversing part of a patch (and ignoring the rest):

	      filterdiff -i file.c patchfile | \
		interdiff /dev/stdin /dev/null

       There  are currently no known bugs in interdiff; but there are some caveats. If you find a
       bug, please report it (along with a minimal test case) to Tim Waugh <twaugh@redhat.com>.

       There are some sets of patches in which there is just not enough information to produce	a
       proper  interdiff. In this case, the strategy employed is to revert the original patch and
       apply the new patch. This, unfortunately, means that interdiffs are not guaranteed  to  be


       Tim Waugh <twaugh@redhat.com>.
       Man page edited by Michael K. Johnson <johnsonm@redhat.com>.

patchutils				   22 July 2002 			     INTERDIFF(1)
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