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  1. or download this
    if (@ARGV)
{
...
  Download(GetArgs());
  EXIT(0, 'SUCCESS. Argument was received from stdin.');
}
  2. or download this
    if (@ARGV) {
    if (@ARGV == 1) {
...

Download(GetArgs());
EXIT(0, 'SUCCESS. Argument was received from stdin.');
  3. or download this
    use strict;
use warnings;
...

PrintUsage();
EXIT(-1, 'Argument missing.');