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Full Discussion: Join files on multiple fields
Top Forums Shell Programming and Scripting Join files on multiple fields Post 302950831 by Scrutinizer on Wednesday 29th of July 2015 07:35:14 AM
Old 07-29-2015
Note that this is technically not a join operation since you are also merging on fields that the files do not have in common, so the join command would not work anyway.

Also, these are TAB separated files and you are leaving out the last 5 empty fields in each file.

I cut off the last 5 fields is to assume there are no spaces in the fields and there are no other empty fields and use the default FS instead of \t plus use $1=$1 so the empty fields are discarded. If that is OK than this could work:

Code:
awk '
  BEGIN {
    OFS="\t"
  }
  FNR==1{
    X[++c]=$3                             # save the third fied; X[1] of the first file X[2] of the second one.
  }
  {
    $1=$1                                 # Discard last 5 trailing fields because FS is default
    i=$1 OFS $2                           # set i to the first two fields, separated by OFS
  } 
  NR==FNR {                               # process first file
    A[i]=$0                               # Put record from first file into array A with first two fields as index
    next
  }
                                          # process second file
  i in A {                                # if the record exist in A, print joined record
    print A[i],$3,$4,$5,$6,$7
    delete A[i]                           # delete record since index was matched
    next
  }
  {                                       # if the record does not exist in A
    print i,X[1],0,0,0,0,$3,$4,$5,$6,$7   # print it with the remaing fields zeroed and the saved 3rd field of file 1
  } 
  END {
    for(i in A)                           # For the remaining records in file 1 that were not matched
      print A[i],X[2],0,0,0,0             # print them with the remaing fields zeroed and the saved 3rd field of file 2
  }
' file1 file2                             # process file1 first and then file 2

If that is not OK then the fields need to be assigned differently (or the trailing fields need to be discardedd in a different way) and FS should be set to \t
Last edited by Scrutinizer; 07-29-2015 at 08:54 AM..
This User Gave Thanks to Scrutinizer For This Post:
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LEARN ABOUT REDHAT

join

JOIN(1) 								FSF								   JOIN(1)

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

       -a SIDE
	      print unpairable lines coming from file SIDE

       -e EMPTY
	      replace missing input fields with EMPTY

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

       -j FIELD
	      (obsolescent) equivalent to `-1 FIELD -2 FIELD'

       -j1 FIELD
	      (obsolescent) equivalent to `-1 FIELD'

       -j2 FIELD
	      (obsolescent) equivalent to `-2 FIELD'

       -o FORMAT
	      obey FORMAT while constructing output line

       -t CHAR
	      use CHAR as input and output field separator

       -v SIDE
	      like -a SIDE, 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 `SIDE.FIELD' or `0'.	Default FORMAT outputs the
       join field, the remaining fields from FILE1, the remaining fields from FILE2, all separated by CHAR.

AUTHOR

       Written by Mike Haertel.

REPORTING BUGS

       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2002 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 PARTICU-
       LAR PURPOSE.

SEE ALSO

       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.

join (coreutils) 4.5.3						   February 2003							   JOIN(1)
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