JOIN

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 SIDE

print unpairable lines coming from file SIDE

?e EMPTY

replace missing input fields with EMPTY

?i, ??ignore?case ignore differences in case when comparing fields

?j FIELD

(obsolescent) equivalent to ‘-1 FIELD ?2 FIELD’

?j1 FIELD

(obsolescent) equivalent to ‘-1 FIELD’

?j2 FIELD

(obsolescent) equivalent to ‘-2 FIELD’

?o FORMAT

obey FORMAT while constructing output line

?t CHAR

use CHAR as input and output field separator

?v SIDE

like ?a SIDE, 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 ‘SIDE.FIELD’ or ‘0’. Default FORMAT outputs the join field, the remaining fields from FILE1, the remaining fields from FILE2, all separated by CHAR.

Written by Mike Haertel.

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

Copyright © 1999 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 PARTICULAR PURPOSE.

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.