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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 blanks.

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

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

replace missing input fields with EMPTY

-i, --ignore-case
ignore differences in case when comparing fields

equivalent to '-1 FIELD -2 FIELD'

obey FORMAT while constructing output line

use CHAR as input and output field separator

like -a FILENUM, but suppress joined output lines

join on this FIELD of file 1

join on this FIELD of file 2

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

do not check that the input is correctly sorted

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

--help display this help and exit

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. 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.

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