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GENDIFF(1)                                                          GENDIFF(1)

       gendiff - utility to aid in error-free diff file generation

       gendiff <directory> <diff-extension>

       gendiff  is  a  rather  simple script which aids in generating a diff file from a single directory.  It takes a
       directory name and a "diff-extension" as its only arguments.  The diff extension should be a unique sequence of
       characters  added to the end of all original, unmodified files.  The output of the program is a diff file which
       may be applied with the patch program to recreate the changes.

       The usual sequence of events for creating a diff is to create two identical directories, make  changes  in  one
       directory, and then use the diff utility to create a list of differences between the two.  Using gendiff elimi-
       nates the need for the extra, original and unmodified directory copy.  Instead, only the individual files  that
       are modified need to be saved.

       Before  editing  a  file,  copy the file, appending the extension you have chosen to the filename.  I.e. if you
       were going to edit somefile.cpp and have chosen the extension "fix", copy it to somefile.cpp.fix before editing
       it.  Then edit the first copy (somefile.cpp).

       After  editing  all  the files you need to edit in this fashion, enter the directory one level above where your
       source code resides, and then type

           $ gendiff somedirectory .fix > mydiff-fix.patch

       You should redirect the output to a file (as illustrated) unless you want to see the results on stdout.

       diff(1), patch(1)

       Marc Ewing <>

4th Berkeley Distribution       Mon Jan 10 2000                     GENDIFF(1)