

COMM                           1/11/79                            COMM


NAME
       comm - print lines common to two files

SYNOPSIS
       comm [-123] file1 [file2]

DESCRIPTION
       Comm  reads  file1  and  file2,  which  should  be  sorted, 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.   If  there  is  only one file argument, file2
       refers to the standard input.
       
       The optional arguments -1, -2, and -3 specify the  printing  of
       only  the  corresponding  column.  Thus comm -3 prints only the
       lines common to both files, and comm -12 prints lines which are
       in either file, but not in both. The default is -123.

FILES
       None

SEE ALSO
       The tool 'cmp'; the Unix tool 'diff'.

DIAGNOSTICS
       A message is printed if an input file cannot be opened.

AUTHORS

       Debbie Scherrer

BUGS
       The flags used by this tool are the reverse of  those  used  by
       the  Unix  'comm'.   In  Unix,  the  flags 1, 2, and 3 suppress
       printing of the corresponding column. Kernighan, on page 126 of
       'Software Tools' suggests the version used above.

















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