

COMM (1)                     1/11/79                     COMM (1)


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
       diff

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

AUTHORS

       Debbie Scherrer (Lawrence Berkeley Laboratory)

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
       sssuuupppppprrreeessssss    printing    of   the   corresponding   column.
       Kernighan, on page 126 of 'Software  Tools'  suggests  the
       version used above. 




















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