if (@ARGV)
{
  if (@ARGV == 1)
  {
    Download($ARGV[0]);
    EXIT(0, 'SUCCESS. Argument was received from command line.');
  }
  else
  {
    PrintUsage();
    EXIT(-1, 'Argument missing.');
  }
}
else
{
  Download(GetArgs());
  EXIT(0, 'SUCCESS. Argument was received from stdin.');
}