diff3 man page on OSF1

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diff3(1)							      diff3(1)

NAME
       diff3 - Compares three files

SYNOPSIS
       diff3 [-e  | -x	| -E  | -X  | -3] file1 file2 file3

       The diff3 command reads three versions of a file and writes to standard
       output the ranges of text that differ.

OPTIONS
       Creates an edit script for use with the ed command to incorporate  into
       file1  all  changes  between file2 and file3 (that is, the changes that
       normally would be flagged ==== and ====3).  Produces an edit script  to
       incorporate only changes flagged ====.  These are similar to -e and -x,
       respectively, but treat overlapping changes (that is, changes that  are
       flagged ==== in the normal listing) differently.	 The overlapping lines
       from both files are inserted by the edit script,	 bracketed  by	<<<<<<
       and  >>>>>>  lines.  The	 -E option is used by RCS merge to ensure that
       overlapping changes in the merged files are preserved  and  brought  to
       someone's  attention.   Produces	 an  edit  script  to incorporate only
       changes flagged ====3.

DESCRIPTION
       The diff3 command reads three versions of a file and writes to standard
       output  the  ranges  of	text  that  differ, flagged with the following
       codes: All three files differ.  file1 differs.  file2  differs.	 file3
       differs.

       The  type  of change needed to convert a given range of a given file to
       match another file is indicated in one of these two ways in the output:
       Text is to be added after line number number1 in file, where file is 1,
       2, or 3.	 Text in the range line number1	 to  line  number2  is	to  be
       changed.	  If  number1  = number2, the range may be abbreviated to num‐
       ber1.

       The original contents of the range follow immediately after a c indica‐
       tion.   When  the  contents  of two files are identical, diff3 does not
       show the contents of the lower-numbered file,  although	it  shows  the
       location of the identical lines for each.

NOTES
       Editing	scripts produced by the -e option cannot create lines consist‐
       ing only of a single . (dot).

EXAMPLES
       To list the  differences	 among	three  files,  enter:  diff3   fruit.a
       fruit.b	fruit.c

       fruit.a, fruit.b, and fruit.c contain the following data:

       fruit.a:

       banana grape kiwi lemon mango orange peach pare

       fruit.b:

       apple banana grapefruit kiwi orange peach pear

       fruit.c:

       grape grapefruit kiwi lemon mango orange peach pear

       The output from diff3 shows the differences between these files as fol‐
       lows. (The comments on the right do not appear in the output.)

       ====	All three files are different.	1:1,2c	      - Lines 1 and  2
       of the first file, fruit.a
	 banana
	 grape 2:1,3c	     - Lines 1 through 3 of fruit.b
	 apple
	 banana
	 grapefruit 3:1,2c	  - Lines 1 and 2 of fruit.c
	 grape
	 grapefruit  ====2     The second file, fruit.b, is different.	1:4,5c
       - Lines 4 and 5 are the same  in	 fruit.a  and  fruit.c.	  2:4a	3:4,5c
       - To make fruit.b look the same, add text after line 4.
	 lemon
	 mango ====1	The first file, fruit.a, is different.	1:8c
	 pare  2:7c	     - Line 7 of fruit.b and line 8 of fruit.c are the
       same.  3:8c
	 pear

FILES
       Helper program.

SEE ALSO
       Commands:  bdiff(1), cmp(1), comm(1), diff(1), ed(1)

								      diff3(1)
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