First off: always use strictures (use strict; use warnings;).

A few other standard imprecations are:

• eschew global variables. In particular don't use global variables in subs.
• use the three parameter version of open.
• always check the result from open and other such functions.
• use lexical file handles: open my $inFile, '<', $fileName or die "Can't open $fileName:$!\n";
• avoid hand rolled and hand parsed HTML. Use suitable modules instead - there are a few: (HTML).

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