Section: User Commands (1)
Updated: October 2008
Sommaire  

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

--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 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.

Written by Mike Haertel.  

Report bugs to <bug-coreutils@gnu.org>.  

Copyright © 2008 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.  

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 join

should give you access to the complete manual.

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