xenial (1) join.1.gz

NAME

       join - join lines of two files on a common field

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.

       -a FILENUM
              also print unpairable lines 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

       --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

       --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.   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.

AUTHOR

       Written by Mike Haertel.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report join translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright  ©  2016  Free  Software  Foundation,  Inc.   License  GPLv3+:  GNU  GPL  version  3  or  later
       <http://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.

SEE ALSO

       comm(1), uniq(1)

       Full documentation at: <http://www.gnu.org/software/coreutils/join>
       or available locally via: info '(coreutils) join invocation'