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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-exten-
       sion" as	its only arguments.  The diff extension	should be a unique se-
       quence 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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