FAQ 3.4 How do I find which modules are installed on my system?
From: PerlFAQ Server (comdog_at_panix.com)
Date: 01/30/05
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Date: Sun, 30 Jan 2005 05:03:02 +0000 (UTC)
This message is one of several periodic postings to comp.lang.perl.misc
intended to make it easier for perl programmers to find answers to
common questions. The core of this message represents an excerpt
from the documentation provided with Perl.
--------------------------------------------------------------------
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
File::Find::Rule.
use File::Find::Rule;
my @files = File::Find::Rule->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;
find sub { push @files, $File::Find::name if -f _ && /\.pm$/ },
@INC;
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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