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-exten-
       sion"  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 iden-
       tical directories, make changes in one directory, and then use the diff
       utility to create a list of differences between the two.  Using gendiff
       eliminates  the  need  for the extra, original and unmodified directory
       copy.  Instead, only the individual files that are modified need to  be

       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)

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