What's wrong with your "horrible" code is that you don't use the data in the outer loop. If written like that:

   OUTER: foreach my $outerField (@fields[2,4,5,9,7,1]) {
      my %hash;
         INNER: foreach my $innerField(@fields[2,4,5,9,7,1]) {
            $hash{$innerField}++;
         }
      push @report, \%hash;
   }
[download]

you can see that $outerField is declared but never used. You're actually just doing six times the same thing in a row.

If I were you, I'd get the result of the split into a hash instead of an array, because selecting them by number doesn't help reading.

use strict;
use warnings;
use Data::Dumper;

my %report;
my $nameCount=0;
my @names = map { $_.++$nameCount } ('Key', ) x 10; 
# Here the names will be Key1 to Key10, 
# But you should actually give explicit names with something like
# my @names = qw/Princess Leia Obiwan Kenobi Anakin Skywalker Darth Va
+der Han Solo/;

while (my $line = <DATA>) {
   my %fields;
   @fields{@names} = (split / /, $line); # Here we put the result into
+ a slice of %fields
   foreach my $name (@names) {
      my $value = $fields{$name};
      $report{$name}{$value}++; # Auto vivification here, $report{$nam
+e} magically becomes a hashref      
   }
}

print Dumper \%report;

__DATA__
483 OS dx-32 1 charles list4 aardvark.com ty-off lx-on C 01
483 DS dx-14 1 james list3 23.456.12.7 ty-on lx-on B 01
769 XO dx-32 5 sully nolist widgets.com ty-on lx-on V 07
[download]

$VAR1 = {
          'Key10' => {
                       'C' => 1,
                       'B' => 1,
                       'V' => 1
                     },
          'Key2' => {
                      'XO' => 1,
                      'OS' => 1,
                      'DS' => 1
                    },
          'Key1' => {
                      '483' => 2,
                      '769' => 1
                    },
          'Key5' => {
                      'james' => 1,
                      'sully' => 1,
                      'charles' => 1
                    },
          'Key8' => {
                      'ty-on' => 2,
                      'ty-off' => 1
                    },
          'Key4' => {
                      '1' => 2,
                      '5' => 1
                    },
          'Key6' => {
                      'nolist' => 1,
                      'list3' => 1,
                      'list4' => 1
                    },
          'Key3' => {
                      'dx-32' => 2,
                      'dx-14' => 1
                    },
          'Key7' => {
                      'aardvark.com' => 1,
                      'widgets.com' => 1,
                      '23.456.12.7' => 1
                    },
          'Key9' => {
                      'lx-on' => 3
                    }
        };

So if you want to access the information on the site name, and have named the seventh key "siteName", you just have to go for $report{siteName} instead of $report[7]

Appart from the use of a hash instead of an array, it's pretty much the same as LanX and BrotherUk's ones.

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