Can’t speak for jdporter, but to my way of thinking the loops (C-style instead of foreach-style) are the least of the problems. To my old eyes the major issues are:
$mode never changes, but it’s re-tested each time through the main loop.
The code is monolithic and should be refactored into subroutines (one for each mode).
use warnings; and use strict; are missing, and all the variables are global.
Hope that helps,
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