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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.
- -a FILENUM
- print unpairable lines coming from file FILENUM,
where FILENUM is 1 or 2, corresponding to FILE1 or FILE2
- -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
- -v FILENUM
- like -a FILENUM, but suppress joined output lines
- -1 FIELD
- join on this FIELD of file 1
- -2 FIELD
- join on this FIELD of file
2
- --help
- display this help and exit
- --version
- 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 FORMAT outputs the join field, the
remaining fields from FILE1, the remaining fields from FILE2, all separated
by CHAR.
Important: FILE1 and FILE2 must be sorted on the join fields.
Written
by Mike Haertel.
Report bugs to <bug-coreutils@gnu.org>.
Copyright
© 2004 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is
NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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 join
should give you access to the complete manual.
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