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12.4. What You Should Know

1.What is the default package in a Perl program?
2.What is the symbol table?
3.How can you view the symbol table?
4.What is the @INC array?
5.What is a pragma?
6.What is the PERL5LIB environment variable for?
7.When should you use require?
8.How does require differ from use?
9.What is the Exporter module?
10.What is the EXPORT_OK array? The %EXPORT_TAGS hash?
11.What is the meaning of putting a "1" at the end of a .pl or .pm file?
12.How do you update the @INC array?
13.How do you access subroutines from another package?
14.How do you keep variables private?
15.What is the easiest way to install modules from CPAN?

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