.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.35.
.TH JOIN "1" "December 2006" "join 6.7" "User Commands"
.SH NAME
join \- join lines of two files on a common field
.SH SYNOPSIS
.B join
[\fIOPTION\fR]... \fIFILE1 FILE2\fR
.SH DESCRIPTION
.\" Add any additional description here
.PP
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.
.TP
\fB\-a\fR FILENUM
print unpairable lines coming from file FILENUM, where
FILENUM is 1 or 2, corresponding to FILE1 or FILE2
.TP
\fB\-e\fR EMPTY
replace missing input fields with EMPTY
.TP
\fB\-i\fR, \fB\-\-ignore\-case\fR
ignore differences in case when comparing fields
.TP
\fB\-j\fR FIELD
equivalent to `\-1 FIELD \fB\-2\fR FIELD'
.TP
\fB\-o\fR FORMAT
obey FORMAT while constructing output line
.TP
\fB\-t\fR CHAR
use CHAR as input and output field separator
.TP
\fB\-v\fR FILENUM
like \fB\-a\fR FILENUM, but suppress joined output lines
.TP
\fB\-1\fR FIELD
join on this FIELD of file 1
.TP
\fB\-2\fR FIELD
join on this FIELD of file 2
.TP
\fB\-\-help\fR
display this help and exit
.TP
\fB\-\-version\fR
output version information and exit
.PP
Unless \fB\-t\fR 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.
.PP
Important: FILE1 and FILE2 must be sorted on the join fields.
E.g., use `sort \fB\-k\fR 1b,1' if `join' has no options.
.SH AUTHOR
Written by Mike Haertel.
.SH "REPORTING BUGS"
Report bugs to <bug\-coreutils@gnu.org>.
.SH COPYRIGHT
Copyright \(co 2006 Free Software Foundation, Inc.
.br
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.
.SH "SEE ALSO"
The full documentation for
.B join
is maintained as a Texinfo manual.  If the
.B info
and
.B join
programs are properly installed at your site, the command
.IP
.B info join
.PP
should give you access to the complete manual.