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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

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

       --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.  If FORMAT is the keyword
       'auto', then the first line of  each  file  determines  the  number  of
       fields output for each line.

       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, 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.

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/>
       Report join translation bugs to <http://translationproject.org/team/>

COPYRIGHT
       Copyright  ©  2011  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
       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 8.12		  March 2013			       JOIN(1)
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