cvs commit: perlfaq perlfaq.pod perlfaq3.pod

cvsuser     02/11/12 22:23:50

  Modified:    .        perlfaq.pod perlfaq3.pod
  Log:
  * perlfaq3: How do I find which modules are installed on my system?
     + new answer, which seems to be asked rather frequently
  
  Revision  Changes    Path
  1.14      +5 -1      perlfaq/perlfaq.pod
  
  Index: perlfaq.pod
  ===================================================================
  RCS file: /cvs/public/perlfaq/perlfaq.pod,v
  retrieving revision 1.13
  retrieving revision 1.14
  diff -u -w -r1.13 -r1.14
  --- perlfaq.pod	10 Nov 2002 17:35:47 -0000	1.13
  +++ perlfaq.pod	13 Nov 2002 06:23:50 -0000	1.14
  @@ -1,6 +1,6 @@
   =head1 NAME
   
  -perlfaq - frequently asked questions about Perl ($Date: 2002/11/10 17:35:47 $)
  +perlfaq - frequently asked questions about Perl ($Date: 2002/11/13 06:23:50 $)
   
   =head1 DESCRIPTION
   
  @@ -179,6 +179,10 @@
   =item *
   
   Is there a Perl shell?
  +
  +=item *
  +
  +How do I find which modules are installed on my system?
   
   =item *
   
  
  
  
  1.29      +45 -1     perlfaq/perlfaq3.pod
  
  Index: perlfaq3.pod
  ===================================================================
  RCS file: /cvs/public/perlfaq/perlfaq3.pod,v
  retrieving revision 1.28
  retrieving revision 1.29
  diff -u -w -r1.28 -r1.29
  --- perlfaq3.pod	30 Oct 2002 18:41:25 -0000	1.28
  +++ perlfaq3.pod	13 Nov 2002 06:23:50 -0000	1.29
  @@ -1,6 +1,6 @@
   =head1 NAME
   
  -perlfaq3 - Programming Tools ($Revision: 1.28 $, $Date: 2002/10/30 18:41:25 $)
  +perlfaq3 - Programming Tools ($Revision: 1.29 $, $Date: 2002/11/13 06:23:50 $)
   
   =head1 DESCRIPTION
   
  @@ -59,6 +59,50 @@
   from the source distribution is simplistic and uninteresting, but
   may still be what you want.
   
  +=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
  +Mod::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
  +	
   =head2 How do I debug my Perl programs?
   
   Have you tried C<use warnings> or used C<-w>?  They enable warnings