:)

$ perl -le " use warnings; chomp; "
Use of uninitialized value $_ in scalar chomp at -e line 1.
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Read this if you want to cut your development time in half! / Use strict warnings and diagnostics or die
Basic debugging checklist
brian's Guide to Solving Any Perl Problem
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... Re^8: How to use wxHtmlEasyPrinting (On debugging, verify everything, talk to teddybear ... and links and links
Re^3: highest value in hash (virtual teddybear)