How do I get a list of installed CPAN modules?

Question

Aside from trying

perldoc 

individually for any CPAN module that takes my fancy or going through the file system and loo

Answer 1

$ for M in `perldoc -t perllocal|grep Module |sed -e 's/^.*" //'`; do V=`perldoc -t perllocal|awk "/$M/{y=1;next}y" |grep VERSION |head -n 1`; printf "%30s %s\n" "$M" "$V"; done |sort
              Class::Inspector     *   "VERSION: 1.28"
                    Crypt::CBC     *   "VERSION: 2.33"
               Crypt::Rijndael     *   "VERSION: 1.11"
                    Data::Dump     *   "VERSION: 1.22"
                   DBD::Oracle     *   "VERSION: 1.68"
                           DBI     *   "VERSION: 1.630"
                   Digest::SHA     *   "VERSION: 5.92"
           ExtUtils::MakeMaker     *   "VERSION: 6.84"
                       install     *   "VERSION: 6.84"
               IO::SessionData     *   "VERSION: 1.03"
               IO::Socket::SSL     *   "VERSION: 2.016"
                          JSON     *   "VERSION: 2.90"
                  MIME::Base64     *   "VERSION: 3.14"
                  MIME::Base64     *   "VERSION: 3.14"
                   Mozilla::CA     *   "VERSION: 20141217"
                   Net::SSLeay     *   "VERSION: 1.68"
                        parent     *   "VERSION: 0.228"
                  REST::Client     *   "VERSION: 271"
                    SOAP::Lite     *   "VERSION: 1.08"
                  Task::Weaken     *   "VERSION: 1.04"
                 Term::ReadKey     *   "VERSION: 2.31"
                Test::Manifest     *   "VERSION: 1.23"
                  Test::Simple     *   "VERSION: 1.001002"
                  Text::CSV_XS     *   "VERSION: 1.16"
                     Try::Tiny     *   "VERSION: 0.22"
                   XML::LibXML     *   "VERSION: 2.0108"
         XML::NamespaceSupport     *   "VERSION: 1.11"
                XML::SAX::Base     *   "VERSION: 1.08"

Answer 2

This is answered in the Perl FAQ, the answer which can be quickly found with perldoc -q installed. In short, it comes down to using ExtUtils::Installed or using File::Find, variants of both of which have been covered previously in this thread.

You can also find the FAQ entry "How do I find which modules are installed on my system?" in perlfaq3. You can see a list of all FAQ answers by looking in perlfaq

Answer 3

I wrote a perl script just yesterday to do exactly this. The script returns the list of perl modules installed in @INC using the '::' as the separator. Call the script using -

perl perlmod.pl

OR

perl perlmod.pl <module name> #Case-insensitive(eg. perl perlmod.pl ftp)

As of now the script skips the current directory('.') since I was having problems with recursing soft-links but you can include it by changing the grep function in line 17 from

  grep { $_ !~ '^\.$' } @INC

to just,

@INC

The script can be found here.

Answer 4

perldoc perllocal

Edit: There's a (little) more info about it in the CPAN FAQ

Answer 5

perldoc -q installed

claims that cpan -l will do the trick, however it's not working for me. The other option:

cpan -a

does spit out a nice list of installed packages and has the nice side effect of writing them to a file.

Answer 6

Here's a script by @JamesThomasMoon1979 rewritten as a one-liner

perl -MExtUtils::Installed -e '$i=ExtUtils::Installed->new(); 
      print "$_ ".$i->version($_)."\n" for $i->modules();'