The first thing would be to use strict. First line (after the shebang) should be:

use strict;
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Probably the most important line in your script. That will force you to declare your variables with my (or our or use vars).

Another option is to, when you declare your variables, to initialize them. Something along the lines of:

my $foo = 0;
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If you do that, that will definitely fix your unitialized problems.

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