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       join [OPTION]... FILE1 FILE2


       For  each  pair of input lines with identical join fields, write a line
       to standard output.  The default join field is the first, delimited  by
       whitespace.  When FILE1 or FILE2 (not both) is -, read standard input.

       -a FILENUM
              also  print unpairable lines from file FILENUM, where FILENUM is
              1 or 2, corresponding to FILE1 or FILE2

       -e EMPTY
              replace missing input fields with EMPTY

       -i, --ignore-case
              ignore differences in case when comparing fields

       -j FIELD
              equivalent to '-1 FIELD -2 FIELD'

       -o FORMAT
              obey FORMAT while constructing output line

       -t CHAR
              use CHAR as input and output field separator

       -v FILENUM
              like -a FILENUM, but suppress joined output lines

       -1 FIELD
              join on this FIELD of file 1

       -2 FIELD
              join on this FIELD of file 2

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

              do not check that the input is correctly sorted

              treat  the  first line in each file as field headers, print them
              without trying to pair them

       -z, --zero-terminated
              end lines with 0 byte, not newline

       --help display this help and exit

       'sort'  has no options.  Note, comparisons honor the rules specified by
       'LC_COLLATE'.  If the input is not sorted  and  some  lines  cannot  be
       joined, a warning message will be given.

       GNU  coreutils  online  help:  <http://www.gnu.org/software/coreutils/>
       Report join translation bugs to <http://translationproject.org/team/>


       Written by Mike Haertel.


       Copyright (C) 2013 Free Software Foundation, Inc.  License GPLv3+:  GNU
       GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This  is  free  software:  you  are free to change and redistribute it.
       There is NO WARRANTY, to the extent permitted by law.


       comm(1), uniq(1)

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

              info coreutils 'join invocation'

       should give you access to the complete manual.

GNU coreutils 8.22 November 2016 JOIN(1)

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