DIFF3(1)                                                 DIFF3(1)

          diff3 - 3-way differential file comparison

          diff3 [ -ex3 ] file1 file2 file3

          Diff3 compares three versions of a file, and publishes dis-
          agreeing 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 identi-
          cal, the contents of the lower-numbered file is suppressed.

          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 follow-
          ing command will apply the resulting script to `file1'.

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


          diff(1), idiff(1)

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