Listing all installed modules

kvale has asked for the wisdom of the Perl Monks concerning the following question:

I want a list of installed Perl modules on my system. From perlfaq3, I tried the following code:

#!/usr/bin/perl -w
use strict;

use ExtUtils::Installed;

my ($inst)    = ExtUtils::Installed->new();
my (@modules) = $inst->modules();

foreach my $mod (@modules) {
    print "$_\n";
}
[download]

which results in the useless output

.packlist
.packlist
.packlist
  ...
.packlist
.packlist
.packlist
[download]

I checked out the ExtUtils::Installed manpage and the program seems consistent with the recommended usage.The modules list is supposed to be generated from the set of .packlist, so there is a parsing step missing. What am I (and possibly the faq) doing wrong? This is a perl 5.8.0, Mandrake 9.1 system.

-Mark

Comment on Listing all installed modules Select or Download Code

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Re: Listing all installed modules by AcidHawk (Vicar) on Feb 10, 2004 at 20:13 UTC
this node has a perl one liner to show installed modules. It goes like this `$ perl -MExtUtils::Installed -e'my $inst = ExtUtils::Installed->new(); + print $_, $/ for $inst->modules'` [download] More here and here To get yours to work change `print "$_\n";` to `print "$mod\n";` You are wanting to print $mod as apposed to $_ ----- Of all the things I've lost in my life, its my mind I miss the most.	[reply] [d/l] [select]
Re: Listing all installed modules by scottj (Monk) on Feb 10, 2004 at 21:23 UTC
Not exactly what you're looking for, but `perldoc perllocal` will show everything that you've installed with CPAN. I've also seen a one-liner which does something more along the lines of what you are asking about, although it doesn't seem to return a complete list: `perl -MExtUtils::Installed -e'my $inst = ExtUtils::Installed->new(); print $_, $/ for $inst->modules'` Update: Actually, the second option that I gave does give a complete output. I forgot that ExtUtils::Installed uses "Perl" to represent the core modules. So you're still not technically getting a complete listing of all modules, but according to the method ExtUtils::Installed is using, the listing is complete. Because of the method used by ExtUtils::Installed to represent the core, you are basically getting the same from both of the above options. The difference is that the second returns a nice, clean list, while the first is intended to be in a human-readable format.	[reply] [d/l] [select]
Re: Re: Listing all installed modules by Anonymous Monk on Feb 11, 2004 at 04:45 UTC
beware of evil software that deletes perllocal (stupid Makefile.PL for Everything-base distribution)	[reply]
Re: Listing all installed modules by duff (Parson) on Feb 10, 2004 at 22:51 UTC
Alternatively, you could use the `pminst` program provided with pmtools. Oddly enough, this and the other methods given are listed in the CPAN faq duff	[reply] [d/l]
Re: Listing all installed modules by bassplayer (Monsignor) on Feb 10, 2004 at 20:16 UTC
This is a commonly asked question. Did you search? :-) Update: AcidHawk's got your particular solution above. bassplayer	[reply]