FAQ
Author: comdog
Date: Sat Dec 27 06:08:04 2008
New Revision: 12285

Modified:
perlfaq/trunk/perlfaq3.pod

Log:
* perlfaq3: How do I find which modules are installed on my system?
+ added examples using cpan(1) from the command line


Modified: perlfaq/trunk/perlfaq3.pod
==============================================================================
--- perlfaq/trunk/perlfaq3.pod (original)
+++ perlfaq/trunk/perlfaq3.pod Sat Dec 27 06:08:04 2008
@@ -62,10 +62,19 @@

=head2 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).
+From the command line, you can use the C<cpan> command's C<-l> switch:
+
+ $ cpan -l
+
+You can also use C<cpan>'s C<-a> switch to create an autobundle file
+that C<CPAN.pm> understands and cna use to re-install every module:
+
+ $ cpan -a
+
+Inside a Perl program, 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;

@@ -77,7 +86,12 @@

use File::Find::Rule;

- my @files = File::Find::Rule->extras({follow => 1})->file()->name( '*.pm' )->in( @INC );
+ 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.
@@ -105,12 +119,12 @@
If you cannot read the documentation, the module might not
have any (in rare cases).

- prompt% perldoc Module::Name
+ $ 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
+ $ perl -MModule::Name -e1

=head2 How do I debug my Perl programs?

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groupcvs-perlfaq @
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postedDec 27, '08 at 2:08p
activeDec 27, '08 at 2:08p
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