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 blanks.
When FILE1 or FILE2 (not both) is -, read standard input.
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 FORMAT 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 cannot be joined, a warning message will be given.
Written by Mike Haertel.
GNU coreutils online help:
<https://www.gnu.org/software/coreutils/>
Report join translation bugs to
<https://translationproject.org/team/>
Copyright © 2018 Free Software Foundation, Inc. License
GPLv3+: GNU GPL version 3 or later
<https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO
WARRANTY, to the extent permitted by law.
Full documentation at:
<https://www.gnu.org/software/coreutils/join>
or available locally via: info '(coreutils) join invocation'
February 2019 | GNU coreutils 8.30 |