How do I find out what modules are already install

• perldoc perllocal

  Each time a module is installed on your system, it appends information like the following to a file called perllocal.pod which can be found in /usr/local/lib/perl5/version number/architecture/ or something akin to that. The path for your specific installation is in your @INC which you can divine with perl -V.

  =head2 Wed May 12 13:42:53 1999: C L
  
  =over 4
  
  =item *
  
  C
  
  =item *
  
  C
  
  =item *
  
  C
  
  =item *
  
  C
  
  =back
  

  Each entry includes the Module name, date and time it was installed, where it was installed, linktype [ static or dynamic ], version and executables, if any, included with the module.

• ActivePerl has the PPM utility.

  C:\>ppm query
  Archive-Tar   [0.072 ] module for manipulation of tar archives.
  Compress-Zlib [1.03  ] Interface to zlib compression library
  DBI           [1.13  ] Database independent interface for Perl
  GD            [1.25  ] Interface to Gd Graphics Library
  HTML-Parser   [2.23  ] SGML parser class
  MIME-Base64   [2.11  ] Encoding and decoding of base64 strings
  PPM           [1.1.4 ] Perl Package Manager: locate, install, upgrade software
  

• The pmtools suite written by Tom Christiansen to help navigate and manage Perl module installations. You can obtain them at . From the README:

  This is pmtools -- a suite of small programs to help manage modules.
  The names are totally preliminary, and in fact, so is the code.  We follow
  the "keep it small" notion of many tiny tools each doing one thing well,
  eschewing giant megatools with millions of options.
  

  • pmpath - show the module's full path
  • pmvers - get a module version number
  • pmdesc - get a module description
  • pmall - get all installed modules pmdesc descriptions
  • pmdirs - print the perl module path, newline separated
  • plxload - show what files a given program loads at compile time
  • pmload - show what files a given module loads at compile time
  • pmexp - show a module's exports
  • pminst - find what's installed
  • pmeth - list a class's methods, recursively
  • pmls - long list the module path
  • pmcat - cat the module source through your pager
  • pman - show the module's pod docs
  • pmfunc - show a function source code from a module
  • podgrep - grep in pods of a file
  • pfcat - show pods from perlfunc
  • podtoc - list table of contents of a podpage
  • podpath - show full path of pod file
  • pods - list all standard pods and module pods
  • sitepods - list only pods in site_perl directories
  • basepods - list only normal "man-page" style pods
  • faqpods - list only faq pods
  • modpods - all module pods, including site_perl ones
  • stdpods - list standard pods, not site_perl ones