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.
also print unpairable lines from file FILENUM, where FILENUM is 1 or 2, correspond-
ing to FILE1 or FILE2
replace missing input fields with EMPTY
ignore differences in case when comparing fields
equivalent to '-1 FIELD -2 FIELD'
obey FORMAT while constructing output line
use CHAR as input and output field separator
like -a FILENUM, but suppress joined output lines
join on this FIELD of file 1
join on this FIELD of file 2
check that the input is correctly sorted, even if all input lines are pairable
do not check that the input is correctly sorted
treat the first line in each file as field headers, print them without trying to
end lines with 0 byte, not newline
--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 number counted from 1. FORMAT is one or more
comma or blank separated specifications, each being 'FILENUM.FIELD' or '0'. Default FOR-
MAT outputs the join field, the remaining fields from FILE1, the remaining fields from
FILE2, all separated by CHAR. If FORMAT is the keyword 'auto', then the first line of
each file determines the number of fields output for each line.
Important: FILE1 and FILE2 must be sorted on the join fields. E.g., use "sort -k 1b,1" if
'join' has no options, or use "join -t ''" if 'sort' has no options. Note, comparisons
honor the rules specified by 'LC_COLLATE'. If the input is not sorted and some lines can-
not be joined, a warning message will be given.
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report join transla-
tion bugs to <http://translationproject.org/team/>
Written by Mike Haertel.
Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or
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 coreutils 'join invocation'
should give you access to the complete manual.
GNU coreutils 8.22 June 2014 JOIN(1)