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Linux 2.6 - man page for join (linux section 1)

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, corre-
	      sponding 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

       --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 FOR-
       MAT 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, or use ` join -t '' ' if `sort' has no options.   Note,  compar-
       isons  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 bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report join translation bugs to <http://translationproject.org/team/>

       Copyright (C) 2010 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 command

	      info coreutils 'join invocation'

       should give you access to the complete manual.

GNU coreutils 8.5			  February 2011 				  JOIN(1)

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