Perl: List Available Modules, List Module Search Paths
The standard filename suffix for perl module is “.pm”.
List Available Modules
To get a list of standard module that are bundled with Perl (but not necessarily installed), type in terminal: perldoc perlmodlib.
You can also use the bundled corelist command line util. Use it in terminal.
corelist- show usage help.
corelist /JSON/- search by regex on JSON.
corelist Data::Dumper- Show package version and perl version.
◆ corelist -a Data::Dumper Data::Dumper was first released with perl 5.005 5.005 2.09 … v5.13.3 2.126 v5.13.4 2.126 v5.13.5 2.128 v5.13.6 2.129 v5.13.7 2.130_01 v5.13.8 2.130_02 v5.13.9 2.130_02 v5.13.10 2.130_02 v5.13.11 2.130_02 v5.14.0 2.130_02 v5.14.1 2.130_02 v5.14.2 2.130_02
◆ corelist /JSON/ JSON::PP was first released with perl v5.13.9 JSON::PP::Boolean was first released with perl v5.13.9
Load a Module
To load a package, call use module_name;. It imports all functions in that package.
# -*- coding: utf-8 -*- # perl # loading some commonly used packages use Data::Dumper; # for printing list and hash use File::Find; # for traversing directories
Show Module Documentation
To find out what functions are available in a module, read its documentation, for example perldoc Data::Dumper.
Show Module Load Paths
@INC- Predefined variable. A list of library search paths.
Here is a example showing module search paths and loaded modules:
# -*- coding: utf-8 -*- # perl use Data::Dumper; print Dumper \@INC; # prints all module search paths __END__ $VAR1 = [ '/etc/perl', '/usr/local/lib/perl/5.14.2', '/usr/local/share/perl/5.14.2', '/usr/lib/perl5', '/usr/share/perl5', '/usr/lib/perl/5.14', '/usr/share/perl/5.14', '/usr/local/lib/site_perl', '.' ];
Show Loaded Modules
%INC- Predefined variable. A hash of loaded modules.
# -*- coding: utf-8 -*- # perl use Data::Dumper; print Dumper \%INC; # prints all loaded modules __END__ $VAR1 = { 'warnings/register.pm' => '/usr/share/perl/5.14/warnings/register.pm', 'bytes.pm' => '/usr/share/perl/5.14/bytes.pm', 'XSLoader.pm' => '/usr/share/perl/5.14/XSLoader.pm', 'Carp.pm' => '/usr/share/perl/5.14/Carp.pm', 'Exporter.pm' => '/usr/share/perl/5.14/Exporter.pm', 'strict.pm' => '/usr/share/perl/5.14/strict.pm', 'warnings.pm' => '/usr/share/perl/5.14/warnings.pm', 'overload.pm' => '/usr/share/perl/5.14/overload.pm', 'Data/Dumper.pm' => '/usr/lib/perl/5.14/Data/Dumper.pm' };