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JOIN(1)                          User Commands                         JOIN(1)

       join - join lines of two files on a common field

       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
              print unpairable lines coming from file FILENUM, where FILENUM is 1 or  2,  corresponding  to  FILE1  or

       -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

       --help display this help and exit

              output version information and exit

       Unless  -t  CHAR  is  given, leading blanks separate fields and are ignored, else fields are separated by CHAR.
       Any FIELD is a field number counted from 1.  FORMAT is one or more comma  or  blank  separated  specifications,
       each being 'FILENUM.FIELD' or '0'.  Default FORMAT outputs the join field, the remaining fields from FILE1, the
       remaining fields from FILE2, all separated by CHAR.

       Important: FILE1 and FILE2 must be sorted on the join fields.  E.g., use  'sort  -k  1b,1'  if  'join'  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.

       Written by Mike Haertel.

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

       Copyright  (C)  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 permit-
       ted 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 command

              info coreutils 'join invocation'

       should give you access to the complete manual.

GNU coreutils 8.4                 March 2017                           JOIN(1)