That could simply be:

#!/usr/bin/perl
foreach("00001".."00021"){
  print "$_\n";
}

[download]

Edit: Just showing that the increment operator is a bit magical, but now I see I've probably missed the point a bit.

-Any sufficiently advanced technology is
indistinguishable from doubletalk.

My Biz

In reply to Re^2: increment # but keep # of digits same by Hero Zzyzzx
in thread increment # but keep # of digits same by yankeeblue

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