So you want to lookup the field number given the field name? Hashes are usually great as lookup tables. You can use $. to determine whether this is the first line of the file or not (or you could create a flag). 

use strict;
use warnings;

my %col_idx;

open(my $result_fh, '<', 'file')               # 3-arg safer
   or die("Unable to open input file: $!\n");  # $! meaningful

while (<$result_fh>) {
   chomp();                                    # chomp safer
   my @fields = split(/;/, $_);

   if ($. == 1) {
      @col_idx{@fields} = 0..$#fields;
   } else {
      # Do what you want here.
      print "$fields[$col_idx{name}], ";
      print "$fields[$col_idx{postcode}]\n";
   }
}

[download]

In reply to Re: get array number by ikegami
in thread get array number by darrengan

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.