You mean the frequency of that value? Use the classic word frequency count idiom (a task that is very simple in Perl: use a hash). It's not because it's a number that you cannot treat it as a string. 
my %frequency;
while(<>) {
    my @column = split ' ' or next;
    $frequency{$column[2]}++;
}

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Now you can just print out what you've got. 
{
    local($\, $,) = ("\n", "\t");  # tab delimited output
    foreach (sort { $frequency{$b} <=> $frequency{$a} || $a <=> $b } k
+eys %frequency) {
        print $_, $frequency{$_};
    }
}

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Here's the result I got from your sample: 
35324    4
33227    3
33308    2
33011    1
35537    1
35606    1

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In reply to Re: to count the number of occurence of a number by bart
in thread to count the number of occurence of a number by extrem

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