in reply to Avoiding silly programming mistakes

Um, always use strictures (use strict; use warnings; - see The strictures, according to Seuss). :-D

Try whittling problem code down to a small sample suitable for posting to PerlMonks - you almost never have to post the actual code though.

Use a good syntax checking editor. Heed all warnings. Write test suites and run coverage tests.

Avoid writing code (use other peoples modules - CPAN).

Think about edge cases and test for them.

Perl reduces RSI - it saves typing
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