Minor but important note: the shebang at the top of your script needs to be

#!/usr/bin/perl
[download]

instead of the '#usr/bin/perl' or '#!usr/bin/perl' as you have it in the above scripts. Your version will work in, say, Windows (which ignores the shebang, although it honors any switches present on the shebang line), but would fail on a Unix box.

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Human history becomes more and more a race between education and catastrophe. -- HG Wells