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COMM(1)			FreeBSD	General	Commands Manual		       COMM(1)

NAME
     comm -- select or reject lines common to two files

SYNOPSIS
     comm [-123i] file1	file2

DESCRIPTION
     The comm utility reads file1 and file2, which should be sorted lexically,
     and produces three	text columns as	output:	lines only in file1; lines
     only in file2; and	lines in both files.

     The filename ``-''	means the standard input.

     The following options are available:

     -1	     Suppress printing of column 1, lines only in file1.

     -2	     Suppress printing of column 2, lines only in file2.

     -3	     Suppress printing of column 3, lines common to both.

     -i	     Case insensitive comparison of lines.

     Each column will have a number of tab characters prepended	to it equal to
     the number	of lower numbered columns that are being printed.  For exam-
     ple, if column number two is being	suppressed, lines printed in column
     number one	will not have any tabs preceding them, and lines printed in
     column number three will have one.

     The comm utility assumes that the files are lexically sorted; all charac-
     ters participate in line comparisons.

ENVIRONMENT
     The LANG, LC_ALL, LC_COLLATE, and LC_CTYPE	environment variables affect
     the execution of comm as described	in environ(7).

EXIT STATUS
     The comm utility exits 0 on success, and >0 if an error occurs.

SEE ALSO
     cmp(1), diff(1), sort(1), uniq(1)

STANDARDS
     The comm utility conforms to IEEE Std 1003.2-1992 (``POSIX.2'').

     The -i option is an extension to the POSIX	standard.

HISTORY
     A comm command appeared in	Version	4 AT&T UNIX.

FreeBSD	9.2		       December	12, 2009		   FreeBSD 9.2

NAME | SYNOPSIS | DESCRIPTION | ENVIRONMENT | EXIT STATUS | SEE ALSO | STANDARDS | HISTORY

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