NAME¶

join - 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 blanks.

When FILE1 or FILE2 (not both) is -, read standard input.

SYNOPSIS¶

join [-a ] [-v ] [-e ] [-i|--ignore-case] [-j ] [-o ] [-t ] [-1 ] [-2 ] [--check-order] [--nocheck-order] [--header] [-z|--zero-terminated] [-h|--help] [-V|--version] <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 blanks.

When FILE1 or FILE2 (not both) is -, read standard input.

OPTIONS¶

-a <FILENUM>

also print unpairable lines from file FILENUM, where FILENUM is 1 or 2, corresponding to FILE1 or FILE2

Possible values:

-v <FILENUM>

like -a FILENUM, but suppress joined output lines

Possible values:

-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

-1 <FIELD>

join on this FIELD of file 1

-2 <FIELD>

join on this FIELD of file 2

--check-order

check that the input is correctly sorted, even if all input lines are pairable

--nocheck-order

do not check that the input is correctly sorted

--header

treat the first line in each file as field headers, print them without trying to pair them

-z, --zero-terminated

line delimiter is NUL, not newline

-h, --help

Print help

-V, --version

Print version

VERSION¶

v(uutils coreutils) 0.8.0

EXAMPLES¶

Join two files on the first (default) field:

join path/to/file1 path/to/file2

Join two files using a comma (instead of a space) as the field separator:

join -t ',' path/to/file1 path/to/file2

Join field3 of file1 with field1 of file2:

join -1 3 -2 1 path/to/file1 path/to/file2

Produce a line for each unpairable line for file1:

join -a 1 path/to/file1 path/to/file2

Join a file from `stdin`:

cat path/to/file1 | join - path/to/file2

The examples are provided by the tldr-pages project <https://tldr.sh> under the CC BY 4.0 License. Please note that, as uutils is a work in progress, some examples might fail.