FAQ 3.4 How do I find which modules are installed on my system?

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This is an excerpt from the latest version perlfaq3.pod, which
comes with the standard Perl distribution. These postings aim to
reduce the number of repeated questions as well as allow the community
to review and update the answers. The latest version of the complete
perlfaq is at http://faq.perl.org .


3.4: How do I find which modules are installed on my system?

    You can use the ExtUtils::Installed module to show all installed
    distributions, although it can take awhile to do its magic. The standard
    library which comes with Perl just shows up as "Perl" (although you can
    get those with Module::CoreList).

            use ExtUtils::Installed;

            my $inst    = ExtUtils::Installed->new();
            my @modules = $inst->modules();

    If you want a list of all of the Perl module filenames, you can use

            use File::Find::Rule;

            my @files = File::Find::Rule->extras({follow => 1})->file()->name(
'*.pm' )->in( @INC );

    If you do not have that module, you can do the same thing with
    File::Find which is part of the standard library.

            use File::Find;
            my @files;

                    wanted => sub {
                        push @files, $File::Find::fullname
                            if -f $File::Find::fullname && /\.pm$/
                    follow => 1,
                    follow_skip => 2,

            print join "\n", @files;

    If you simply need to quickly check to see if a module is available, you
    can check for its documentation. If you can read the documentation the
    module is most likely installed. If you cannot read the documentation,
    the module might not have any (in rare cases).

            prompt% perldoc Module::Name

    You can also try to include the module in a one-liner to see if perl
    finds it.

            perl -MModule::Name -e1


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Re: FAQ 3.4 How do I find which modules are installed on my system?

Quoted text here. Click to load it
=3D> 1})->file()->name( '*.pm' )->in( @INC );
Quoted text here. Click to load it

I wonder if anyone does this as per FAQ, I found this some time ago;

# perl -MFile::Find=3Dfind -MFile::Spec::Functions -Tlwe 'find { wanted
=3D> sub { print canonpath $_ if /\.pm\z/ }, no_chdir => 1 }, @INC'

and seems to the job.


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