join - join
NAME SYNOPSIS DESCRIPTION OPTIONSNAME
join − join
SYNOPSIS
join [OPTION]... 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