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perlfaq7

Current Perl documentation can be found at perldoc.perl.org.

Here is our local, out-dated (pre-5.6) version:

This section deals with general Perl language issues that don't clearly fit into any of the other sections.

Can I get a BNF/yacc/RE for the Perl language?
What are all these $@%* punctuation signs, and how do I know when to use them?
Do I always/never have to quote my strings or use semicolons and commas?
How do I skip some return values?
How do I temporarily block warnings?
What's an extension?
Why do Perl operators have different precedence than C operators?
How do I declare/create a structure?
How do I create a module?
How do I create a class?
How can I tell if a variable is tainted?
What's a closure?
What is variable suicide and how can I prevent it?
How can I pass/return a {Function, FileHandle, Array, Hash, Method, Regexp}?
How do I create a static variable?
What's the difference between dynamic and lexical (static) scoping? Between local() and my()?
How can I access a dynamic variable while a similarly named lexical is in scope?
What's the difference between deep and shallow binding?
Why doesn't "my($foo) = <FILE>;" work right?
How do I redefine a builtin function, operator, or method?
What's the difference between calling a function as &foo and foo()?
How do I create a switch or case statement?
How can I catch accesses to undefined variables/functions/methods?
Why can't a method included in this same file be found?
How can I find out my current package?
How can I comment out a large block of perl code?