Here is a method, if I understand your wording right, to use header TEXT indexes. 

use strict;
use warnings;

my $File_Deal = $ARGV[0];
my $File_ATT = $ARGV[1];

open(F1, "<", $File_Deal) or die $!;

my $header_line;
my @header_array;

# File_Deal
chomp( $header_line = <F1> );
@header_array = split('\|', $header_line );
my %HEADER_File_Deal = map { $header_array[$_] => $_ } (0..@header_arr
+ay-1);


my %hash = ();
while( <F1> ) {
  chomp;
  my @values = split(/\|/, $_);
  # parent_cusp|cusp|isin|deal|tranche|det_date|col_type
  my $key = $values[$HEADER_File_Deal{"parent_cusp"}]
    . $values[$HEADER_File_Deal{"deal"}]
    . $values[$HEADER_File_Deal{"tranche"}];

  print "key=$key is ( @values )\n";
}

[download]

In reply to Re: Outer Join on 2 files by FreeBeerReekingMonk
in thread Outer Join on 2 files by healingtao

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.