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DIFF3(1)										 DIFF3(1)

NAME
       diff3 - 3-way differential file comparison

SYNOPSIS
       diff3 [ -exEX3 ] file1 file2 file3

DESCRIPTION
       Diff3  compares three versions of a file, and publishes disagreeing ranges of text flagged
       with these codes:

       ====	       all three files differ

       ====1	       file1 is different

       ====2	       file2 is different

       ====3	       file3 is different

       The type of change suffered in converting a given range of a given file to some	other  is
       indicated in one of these ways:

       f : n1 a        Text  is to be appended after line number n1 in file f, where f = 1, 2, or
		       3.

       f : n1 , n2 c   Text is to be changed in the range line n1 to line n2.  If n1  =  n2,  the
		       range may be abbreviated to n1.

       The  original  contents	of  the range follows immediately after a c indication.  When the
       contents of two files are identical, the contents  of  the  lower-numbered  file  is  sup-
       pressed.

       Under the -e option, diff3 publishes a script for the editor ed that will incorporate into
       file1 all changes between file2 and file3,  i.e.   the  changes	that  normally	would  be
       flagged	====  and  ====3.   Option  -x (-3) produces a script to incorporate only changes
       flagged ==== (====3).  The following command will apply the resulting script to `file1'.

		(cat script; echo '1,$p') | ed - file1

       The -E and -X are similar to -e and -x, respectively, but treat overlapping changes (i.e.,
       changes	that would be flagged with ==== in the normal listing) differently.  The overlap-
       ping lines from both files will be inserted by the edit script, bracketed by "<<<<<<"  and
       ">>>>>>" lines.

       For  example,  suppose  lines  7-8 are changed in both file1 and file2.	Applying the edit
       script generated by the command
				      "diff3 -E file1 file2 file3"
       to file1 results in the file:

	      lines 1-6
	      of file1
	      <<<<<<< file1
	      lines 7-8
	      of file1
	      =======
	      lines 7-8
	      of file3
	      >>>>>>> file3
	      rest of file1

       The -E option is used by RCS merge(1) to insure that overlapping  changes  in  the  merged
       files are preserved and brought to someone's attention.

FILES
       /tmp/d3?????
       /usr/libexec/diff3

SEE ALSO
       diff(1)

BUGS
       Text lines that consist of a single `.' will defeat -e.


7th Edition				 October 21, 1996				 DIFF3(1)
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