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sdiff(1)							     sdiff(1)


  sdiff	- Compares two files and displays the differences in a side-by-side


  sdiff	[-l | -s] [-w number] [-o output_file] file1 file2

  The sdiff command reads file1	and file2, uses	diff to	compare	them, and
  writes the results to	standard output	in a side-by-side format.


  -l  Displays only the	left side when lines are identical.

  -o output_file
      Creates a	third file, output_file, by a controlled interactive line-
      by-line merging of file1 and file2. The following	subcommands govern
      the creation of this file:

      l	  Adds the left	side to	output_file.

      r	  Adds the right side to output_file.

      s	  Stops	displaying identical lines.

      v	  Begins displaying identical lines.

      e	l or e <&lt;

      e	r or e >&gt;

      e	b or e |

      e	  Enters ed with the left side,	the right side,	both sides, or an
	  empty	file, respectively.

	  Each time you	exit from ed, sdiff writes the resulting edited	file
	  to the end of	output_file.  If you fail to save the changes before
	  exiting, sdiff writes	the initial input to output_file.

      q	  Exits	the interactive	session.

  -s  Suppresses display of identical lines.

  -w number
      Sets the width of	the output line	to number (130 characters by


  The sdiff command displays each line of the two files	with a series of
  spaces between them if the lines are identical, a <&lt; (left angle bracket) in
  the field of spaces if the line only exists in file1,	a >&gt; (right angle
  bracket) if the line only exists in file2, and a | (vertical bar) for	lines
  that are different.

  When you specify the -o option, sdiff	produces a third file by merging
  file1	and file2 according to your instructions.

  Note that the	sdiff command invokes the diff -b command to compare two
  input	files.	The -b option causes the diff command to ignore	trailing
  spaces, tab characters, and consider other strings of	spaces as equal.


   1.  To print	a comparison of	two files, enter:
	    sdiff  chap1.bak  chap1

       This displays a side-by-side listing that compares each line of
       chap1.bak and chap1.

   2.  To display only the lines that differ, enter:
	    sdiff  -s  -w 80  chap1.bak	 chap1

       This displays the differences at	the tty.  The -w 80 sets page width
       to 80 columns.  The -s option tells sdiff not to	display	lines that
       are identical in	both files.

   3.  To selectively combine parts of two files, enter:
	    sdiff -s  -w 80  -o	chap1.combo  chap1.bak	chap1

       This combines chap1.bak and chap1 into a	new file called	chap1.combo.
       For each	group of differing lines, sdiff	asks you which group to	keep
       or whether you want to edit them	using ed.


  Commands:  diff(1), ed(1)