Whoops.

OK, so DataDumper revealed that my script is in fact producing an array full of empty references and I've evidently confused myself more than I thought...consequently I have a new question.

I have a file that looks like this:

7
1 2 20
2 3 15
3 4 3
4 5 17
5 6 28
6 1 23
1 7 1
2 7 4
3 7 9
4 7 16
5 7 25
6 7 36
-1
[download]

What I would like to do is take all the lines that are not the first or last line and make a sortable multidimensional array out of them, as described above.

My current code is:

#!/usr/bin/perl
use warnings;
use strict;
use Data::Dumper;

#open initial file
open FILE, "graph.txt" or die "Error with original file: $!";
#open empty file to write to
#open NEWFILE, ">output.txt" or die "Error with output file: $!";


#Get array with lines of file
my @line_array = <FILE>;

#reduce array to content info only
shift(@line_array);
pop(@line_array);

#initialize item array and something to hold it during loop
our @item_array;
our @hold_array;

#convert each edge string to an array, push it onto item_array
for (my $i = 0; $i < scalar(@line_array); $i++) {
    our $line = $line_array[$i];
    @hold_array = split(/\s/, $line);
    push(@item_array, \@hold_array);
}

print Dumper @item_array;
[download]

This produces in Dumper:

$VAR1 = [
          '6',
          '7',
          '36'
        ];
$VAR2 = $VAR1;
$VAR3 = $VAR1;
$VAR4 = $VAR1;
$VAR5 = $VAR1;
$VAR6 = $VAR1;
$VAR7 = $VAR1;
$VAR8 = $VAR1;
$VAR9 = $VAR1;
$VAR10 = $VAR1;
$VAR11 = $VAR1;
$VAR12 = $VAR1;
[download]

Pretty sure this isn't what I want...am I approaching this the wrong way?

Thank you both for your help, by the way...you're awesome! =)