Perl: Documentation Lookup, Using Builtin Help System

In terminal, type perldoc perl to get a list of topics.

perldoc perlop

Lookup keywords (e.g. if, while, for, etc)

perldoc perlsyn

Lookup operators (e.g. ==,++, =~, etc)

perldoc perlvar

Lookup builtin variables (e.g. @INC, %INC, @ARG, etc)

perldoc -f function_name

Lookup function. e.g. printf.

perldoc module_name

Lookup module e.g. Data::Dumper