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C:\test>perl -M-warnings=uninitialized,numeric,once,void -E"123;$x=1;p
+rint $y; 'A'+0"
Name "main::x" used only once: possible typo at -e line 1.
Use of uninitialized value $y in print at -e line 1.
Argument "A" isn't numeric in addition (+) at -e line 1.
C:\test>perl -wE"say (1+2)*3"
say (...) interpreted as function at -e line 1.
Useless use of multiplication (*) in void context at -e line 1.
Use subroutines for code reuse
Master regular expressions
Write my GUIs with Perl
Abandon CGI in favor of some modern web framework
Put my code in modules
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test and document my code as I write it
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