COMM(C)                                    UNIX System V



     Name
          comm - selects or rejects lines common to two sorted files


     Syntax
          comm [ -123 ] file1 file2


     Description
          comm reads file1 and file2, which should be ordered in ASCII
          collating  sequence  (see  sort(C)),  and  produces a three-
          column output: lines only in file1; lines only in file2; and
          lines  in  both  files.   The  filename - 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.

     See Also
          cmp(C), diff(C), sort(C), uniq(C)


     Standards Conformance
          comm is conformant with:

          AT&T SVID Issue 2, Select Code 307-127;
          and The X/Open Portability Guide II of January 1987.


     (printed 8/28/89)                                  COMM(C)