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       comm - compare two sorted files line by line


       comm [OPTION]... FILE1 FILE2


       Compare sorted files FILE1 and FILE2 line by line.

       With  no  options,  produce  three-column  output.  Column one contains
       lines unique to FILE1, column two contains lines unique to  FILE2,  and
       column three contains lines common to both files.

       -1     suppress column 1 (lines unique to FILE1)

       -2     suppress column 2 (lines unique to FILE2)

       -3     suppress column 3 (lines that appear in both files)

              check  that  the  input  is  correctly sorted, even if all input
              lines are pairable

              do not check that the input is correctly sorted

              separate columns with STR

       --help display this help and exit

              output version information and exit

       Note, comparisons honor the rules specified by ‘LC_COLLATE’.


       comm -12 file1 file2
              Print only lines present in both file1 and file2.

       comm -3
              file1 file2  Print lines in file1 not in file2, and vice  versa.


       Written by Richard M. Stallman and David MacKenzie.


       Report comm bugs to
       GNU coreutils home page: <>
       General help using GNU software: <>
       Report comm translation bugs to <>


       Copyright  ©  2010  Free Software Foundation, Inc.  License GPLv3+: GNU
       GPL version 3 or later <>.
       This is free software: you are free  to  change  and  redistribute  it.
       There is NO WARRANTY, to the extent permitted by law.


       join(1), uniq(1)

       The  full documentation for comm is maintained as a Texinfo manual.  If
       the info and comm programs are properly installed  at  your  site,  the

              info coreutils 'comm invocation'

       should give you access to the complete manual.