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OpenDarwin 7.2.1 - man page for gendiff (opendarwin section 1)

GENDIFF(1)			     General Commands Manual			       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  differ-
       ences  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 saved.

       Before editing a file, copy the file, appending the extension you have chosen to the file-
       name.  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 <marc@redhat.com>

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

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