join - Unix, Linux Command

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.

Tag	Description
-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.

AUTHOR

Written by Mike Haertel.

REPORTING BUGS

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

COPYRIGHT

Copyright © 2006 Free Software Foundation, Inc.
This is free software. You may redistribute copies of it under the terms of the GNU General Public License <http://www.gnu.org/licenses/gpl.html>. There is NO WARRANTY, to the extent permitted by law.