JOIN linux command manual

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 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

       --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 num-
       ber  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.

       Written by Mike Haertel.

       Report bugs to .

       Copyright (C) 2004 Free Software Foundation, Inc.
       This is free software; see the source for copying  conditions.   There
       is  NO  warranty;  not  even  for  MERCHANTABILITY  or  FITNESS  FOR A

       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

       should give you access to the complete manual.

join (coreutils) 5.2.1             May 2004                           JOIN(1)