ah, I see why you'd want to use  $hash{@temp[-1]}++ but this exhibits bad behavior for files with no extention at all! update

your

  if (($fname =~ /\./) && !($fname =~ /\.$/)) {
    $fname = lc($fname);
    @temp= split(/\./, $fname);
    $hash{$temp[-1]}++;
  }
  else {
    $hash{"no ext"}++;
  }
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seems a little clumsy. consider

    if ($#temp >0)
        {$hash{@temp[-1]}++}
    else
        {$hash{""}++}
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which sees if there's more than 1 bucket in @temp. If there is, we know the lastmost one's the extention. If there isn't we know the filename has no extention. in fact, I think this can be shortened to <code> if ($#temp) <code> but that's not a big deal. I kept the hash named "" for the highly special case of a file, e.g. "foo.no ext"