I have this simple piece of code:

use warnings;
use strict;
use diagnostics;


open(LOG,"C:/WINDOWS/U.S. Robotics 56K Voice INT PnP.log") || die "Can
+'t open1";
open(ARCHIVE,">>H:/ppp_stats.log") || die "Can't open2";


while(<LOG>){
  print ARCHIVE $_;
}

open(LOG,">C:/WINDOWS/U.S. Robotics 56K Voice INT PnP.log") || die "Co
+uldn't truncate logfile!";
close ARCHIVE;
close LOG;
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Basically all I want is for the US Robotics log file to be appended to the ppp_stats log file since Windows truncates the US Robotics file from time to time. it works great 90% of the time but I sometimes get duplicate lines in the appended file. What am I doing wrong?