Most esteemed monks, I suspect I'm missing something really obvious here, but I'm in a quandary. I have a while loop nested inside a for loop, like so: 
for (my $i = 0; $i <= 4; $i++) {
  while (my $line = readline(SORTD)) {
    my $number = substr($line, $i*2, 2);
  }
}

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The problem: the value of i increments fine in the outer block, but the inner block simply receives the initial value of i (0 or otherwise), and never increments. It seems a no-brainer scoping issue, but I expected the for-loop increment to be passed to the inner block. Obviously, that's not happening. What am I missing here?

In reply to For- loop increment not passing to inner block by Anonymous Monk

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