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Perl hints

List of hints:

install CPAN (module archive) module
install module
install module from CPAN shell
install module with CPAN, answer yes/default
install module with CPAN, force
install Net::SSH::Perl on cygwin
use threads
operator continue

operator break
regexp conditional
supress "uninitialized value" warning
multi-line comments
scalar to array/hash
typeof for refrence types