join(1)

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: 1, 2]

-v=FILENUM
    like -a FILENUM, but suppress joined output lines
    [possible values: 1, 2]

-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
v0.0.18