Thanks o Wise Monks. I will try the suggestions. Here is my whole script so you can see how I am using the command. I should have put it here earlier
More then just writing a script to find duplicates, I want to refresh my perl scripts on which I have lost touch over the last few years.

use strict;
use IO::File;
use Digest::MD5 qw(md5);

my ($aLen, $i, $j, $tFile, $sFile);
my (@sDir,@tDir);
my ($cFile, $ex1, $ex2);
my ($cFile2, $chk1, $chk2);
my ($fs1, $fs2);

my($par1,$par2,$par3,$par4) = ($ARGV[0],$ARGV[1],$ARGV[2],$ARGV[3]) ; 
+ # Expects a slash at the end if directory
# par1 is the directory to Check
# par2 is directory to check against
#   Exact dups are placed in ncn_cmp.bat to delete from first folder
#   Differences in ncn_diff.txt as either missing or different
<br>
$par1 = $par1 || ".\\";
$ex1 = $par2 || ".err";
$ex2 = $par3 || ".fmx";
$par4 = $par4 || "NCN";
$chk1 = "Apple";

open (OUT, ">ncn_cmp.bat");
open (DF, ">ncn_diff.txt");
open (SM, ">ncn_same.txt");
$tFile="XXX";

if (-d $par1) {
  opendir D1, $par1;
  #@tDir=sort (readdir D1);
  #@sDir=sort {-s $a <=> -s $b } @tDir;
  @sDir=sort {-s $a <=> -s $b } (readdir D1);
  $aLen = @sDir;
  for ($j=0;$j<$aLen;$j++){
    next if !(-f $par1 . "\\" .$sDir[$j]);
    next if $sDir[$j] eq "ncn_cmp.bat";
    next if $sDir[$j] eq "ncn_diff.txt";
    next if $sDir[$j] eq "ncn_same.txt";
        if ($par1 =~ s/\\$//g){
      $sFile = $par1 . $sDir[$j];
        } else {
      $sFile = $par1 . "\\" . $sDir[$j];
        } 
    #$sFile = $par1 . "\\" . $sDir[$j];
    if ($tFile eq "XXX") {
      $tFile = $sFile;
      next;
    }
    $fs1 = -s $sFile;
    $fs2 = -s $tFile;
    if ($fs1 eq $fs2) {
      open(TST, "<", $tFile);
      $chk2 = md5(<TST>);
      close(TST);
      open(TST, "<", $sFile);
      $chk1 = md5(<TST>);
      close(TST);
    } else {
      # print $sFile . " size " . $fs1 . "\n";
      # print $tFile . " size " . $fs2 . "\n";
      $chk2 = "DIF";
    }
    if ($chk1 eq $chk2) {
      print OUT "del \"" . $sFile . "\"\n";
      print SM "echo N | comp " . $tFile . " " . $sFile .  "\n";
    } else {
      if ($chk2 eq "NCN") {
        print DF $tFile . " Not Found\n";
      } else {<br>
        print DF $tFile . " and " . $sFile .  " different\n";
      }
    }
    $chk1 = "ABC";
    $chk2 = "DEF";
    $tFile = $sFile;
  }
}
print OUT "del ncn_diff.txt\n";
print OUT "del ncn_same.txt\n";
print OUT "del ncn_cmp.bat\n";
close(OUT);
close(DF);
close(SM);
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