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JOIN(1)				 User Commands			       JOIN(1)

NAME
       join - join lines of two	files on a common field

SYNOPSIS
       join [OPTION]...	FILE1 FILE2

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

       --nocheck-order
	      do not check that	the input is correctly sorted

       --help display this help	and exit

       --version
	      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 num-
       ber counted from	1.  FORMAT is one or more  comma  or  blank  separated
       specifications, each being `FILENUM.FIELD' or `0'.  Default FORMAT out-
       puts 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.   If  the	input  is  not
       sorted  and  some  lines	 cannot	 be  joined, a warning message will be
       given.

AUTHOR
       Written by Mike Haertel.

REPORTING BUGS
       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/>

COPYRIGHT
       Copyright (C) 2009 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.

SEE ALSO
       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 7.1		   July	2010			       JOIN(1)

NAME | SYNOPSIS | DESCRIPTION | AUTHOR | REPORTING BUGS | COPYRIGHT | SEE ALSO

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