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  1. or download this
    elsif(($#ARGV+1) < 1) {
  2. or download this
    elsif ($#ARGV < 0) {
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    elsif (@ARGV < 1) {
# or, if you prefer an explicitly stated scalar context:
elsif (scalar @ARGV < 1) {
  4. or download this
    if(! -e "$Dir") {
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    use strict;
use warnings;
...
chdir $dir;
mkdir "FirstSubDir";
mkdir "SecondSubDir";