comm(1)                                                   comm(1)



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

     SYNOPSIS
          comm [-[123]] file1 file2

     DESCRIPTION
          comm reads file1 and file2, which should be ordered in ASCII
          collating sequence (see sort(1)), and produces a three-
          column output: lines only in file1; lines only in file2; and
          lines in both files.  The file name - means the standard
          input.

          Flags 1, 2, or 3 suppress printing of the corresponding
          column.  Thus comm -12 prints only the lines common to the
          two files; comm -23 prints only lines in the first file but
          not in the second; comm -123 is a no-op.

     EXAMPLE
               comm -12 filea fileb

          prints only the lines common to filea and fileb.

               comm -23 filea fileb

          prints only lines in the first file but not in the second.

               comm -123 filea fileb

          is not an option, as it suppresses all output.

               comm -3 filea fileb

          prints only the lines that differ in the two files.

     FILES
          /usr/bin/comm

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















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