NAME
	  comm - Compares two sorted files

     SYNOPSIS
	  comm [-123] file1 file2


	  The comm command reads file1 and file2 and writes three
	  columns to standard output, showing which lines are common
	  to the files and which are unique to each.

     FLAGS
	  -1  Suppresses output	of the first column (lines in file1
	      only).

	  -2  Suppresses output	of the second column (lines in file2
	      only).

	  -3  Suppresses output	of the third column (lines common to
	      file1 and	file2).


	  comm -123 produces no	output.

     DESCRIPTION
	  The leftmost column of standard output includes lines	that
	  are in file1 only.  The middle column	includes lines that
	  are in file2 only.  The rightmost column includes lines that
	  are in both file1 and	file2.

	  If you specify - (dash) in place of one of the filenames,
	  comm reads standard input.

	  The file1 and	file2 arguments	should be sorted according to
	  the collating	sequence specified by the LC_COLLATE environ-
	  ment variable	(see sort).

     EXAMPLES
	  In the following examples, file1 contains the	following
	  sorted list of North American	cities:

	  Anaheim
	  Baltimore
	  Boston
	  Chicago
	  Cleveland
	  Dallas
	  Detroit
	  Kansas City
	  Milwaukee
	  Minneapolis
	  New York
	  Oakland
	  Seattle
	  Toronto



	  file2	contains this sorted list:

	  Atlanta
	  Chicago
	  Cincinnati
	  Houston
	  Los Angeles
	  Montreal
	  New York
	  Philadelphia
	  Pittsburgh
	  San Diego
	  San Francisco
	  St. Louis



	   1.  To display the lines unique to each file	and common to
	       the two files, enter:

	       comm file1 file2



	       This command results in the following output:

	       Anaheim
		       Atlanta
	       Baltimore
	       Boston
			       Chicago
		       Cincinnati
	       Cleveland
	       Dallas
	       Detroit
		       Houston
	       Kansas City
		       Los Angeles
	       Milwaukee
	       Minneapolis
		       Montreal
			       New York
	       Oakland
		       Philadelphia
		       Pittsburgh
		       San Diego
		       San Francisco
	       Seattle
		       St. Louis
	       Toronto



	       The leftmost column contains lines in file1 only, the
	       middle column contains lines in file2 only, and the
	       rightmost column	contains lines common to both files.

	   2.  To display any one or two of the	three output columns,
	       include the appropriate flags to	suppress the columns
	       you do not want.	 For example, the following command
	       displays	lines that appear in file1 and in file2	only:

	       comm -3 file1 file2


	       Anaheim
		       Atlanta
	       Baltimore
	       Boston
		       Cincinnati
	       Cleveland
	       Dallas
	       Detroit
		       Houston
	       Kansas City
		       Los Angeles
	       Milwaukee
	       Minneapolis
		       Montreal
	       Oakland
		       Philadelphia
		       Pittsburgh
		       San Diego
		       San Francisco
	       Seattle
		       St. Louis
	       Toronto



	   3.  The following command displays lines that appear	in
	       file2 only:

	       comm -13	file1 file2


	       Atlanta
	       Cincinnati
	       Houston
	       Los Angeles
	       Montreal
	       Philadelphia
	       Pittsburgh
	       San Diego
	       San Francisco
	       St. Louis



	   4.  The following command displays only those lines that
	       appear in both file1 and	file2:

	       comm -12	file1 file2


	       Chicago
	       New York



     RELATED INFORMATION
	  Commands:  cmp(1), ctab(1), diff(1), sdiff(1), sort(1),
	  uniq(1).

	  Files:  ctab(4).

	  "Using Internationalization Features"	in the OSF/1 User's
	  Guide.