Since none of the above code examples quite statisfied me, here's my solution..

# find duplicate entries in array @list
my @sorted = sort (@list);
my @duplicated;

while (@sorted)
{
    my $this = shift (@sorted);

    if ($this eq $sorted[0])
    {
        push (@duplicated, $this);

        while (@sorted and $this eq $sorted[0])
        {
            shift (@sorted);
        }
    }
}

[download]

There is potential to shorten up this code and make it more obfuscated, but for learning purposes this should be alright..

Regards,
-octo

In reply to Re: See if arrays match by flocto
in thread See if arrays match by Anonymous Monk

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