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.

       -a FILENUM
              also print unpairable lines from file FILENUM, where FILENUM is 1 or 2, correspond‐
              ing 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 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  FOR‐
       MAT  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 can‐
       not be joined, a warning message will be given.

       Written by Mike Haertel.

       GNU coreutils online help: 
       Report join translation bugs to 

       Copyright © 2016 Free Software Foundation, Inc.  License GPLv3+:  GNU  GPL  version  3  or
       later .
       This  is free software: you are free to change and redistribute it.  There is NO WARRANTY,
       to the extent permitted by law.

       comm(1), uniq(1)

       Full documentation at: 
       or available locally via: info '(coreutils) join invocation'

GNU coreutils 8.25                        February 2016                                   JOIN(1)


Designed by SanjuD(@ngineerbabu)