if ( $download_status eq "START" ) {
   my $wgetcmd = "wget -o $download_log -O $zipfile -b $zipurl";
   system ( $wgetcmd ) == 0 
      or die __FILE__ . " [" . __LINE__ . "] cannot execute $wgetcmd :$!\n";
   sleep 1;

   my $shell_out = <<`SHELL`;
grep Length $download_log | awk '{print \$3}'
SHELL
   $download_size = $shell_out;
}