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COMM(I)                      8/21/73                      COMM(I)







NAME

     comm - print lines common to two files



SYNOPSIS

     comm [ - [ 123 ] ] file1 file2 [ file3 ]



DESCRIPTION

     Comm reads file1 and file2, which should  be  in  sort,  and

     produces  a  three column output: lines only in file1; lines

     only in file2; and lines in both files.



     If  file3  is  given,  the  output  will  be  placed  there;

     otherwise it will be written on the standard output.



     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

     uniq(I), proof(I), cmp(I)



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