chdir 'D:\COLD\DULS' or die "Can't chdir: $!";
my @files = glob ('cold*');
if (scalar @files)
{
  foreach my $file (@files)
  {
    print CBDOWNLOAD "Cold Backup file exists for DULS for $FileName.\n"
    ...
  }
}
else
{
  system ('awtrap -h RLGH -f DULS "DULSVASG001:  Unable to download the file."'); 
}