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Question

How can I find out where a Perl module is installed?

Answer 1

+11 A:

perl -MTime::HiRes -e 'print $INC{"Time/HiRes.pm"}' or perldoc -l Time::HiRes

jrockway 2009-10-13 02:41:36

perldoc only works for those setupped.the first works for all, but typing the name 2 times is a bit boring.

Galaxy 2009-10-13 03:28:57

On a unixy system, I would just "locate Time/HiRes.pm".

Svante 2009-10-13 07:51:22

If the locate database doesn't have it, for whatever reason, `find /usr/ -path '*/Time/HiRes.pm'`.

Svante 2009-10-13 08:01:30

That doesn't tell you where Perl is looking for the file, though. My Perl modules are in ~/perl/install, for example.

jrockway 2009-10-13 09:11:12

Well, in my situation, user files all in NFS path, and locate just exclude NFS.Since the `PERL5LIB` is a bit long on that system, `find` is not a good way.

Galaxy 2009-10-13 10:27:40

Answer 2

+2 A:

I just find another one: http://www.perlmonks.org/?node%5Fid=568730

#!/bin/sh

echo 'print map { sprintf( "%20s : %s\n", $_, $INC{$_} ) } sort keys %INC; print "\n'$1' version : $'$1'::VERSION\n\n"' | perl "-M$1"

the script just print out everything in %INC when you run perl -MSTH::STH

eg:

$ whichpm CGI       
              CGI.pm : /System/Library/Perl/5.8.6/CGI.pm
         CGI/Util.pm : /System/Library/Perl/5.8.6/CGI/Util.pm
             Carp.pm : /System/Library/Perl/5.8.6/Carp.pm
         Exporter.pm : /System/Library/Perl/5.8.6/Exporter.pm
         constant.pm : /System/Library/Perl/5.8.6/constant.pm
         overload.pm : /System/Library/Perl/5.8.6/overload.pm
           strict.pm : /System/Library/Perl/5.8.6/strict.pm
             vars.pm : /System/Library/Perl/5.8.6/vars.pm
         warnings.pm : /System/Library/Perl/5.8.6/warnings.pm warnings/register.pm : /System/Library/Perl/5.8.6/warnings/register.pm

CGI version : 3.05

Galaxy 2009-10-13 02:55:49

If you just want the version, it's probably easiest to type `perl -MYour::Module\ 999`. If the version number is less than 999, it will be printed.

jrockway 2009-10-13 03:15:51

Okay, but no upvotes unless you can explain what that's doing.

Ether 2009-10-13 03:26:18

Might it not be easier to just do this in Perl rather than wrapping a shell script around it?

Chris Lutz 2009-10-13 16:34:44

Answer 3

+6 A:

You can get module details with the cpan tool that comes with Perl:

$ cpan -D Time::HiRes
Time::HiRes
-------------------------------------------------------------------------
    High resolution time, sleep, and alarm
    J/JH/JHI/Time-HiRes-1.9719.tar.gz
    /usr/local/perls/perl-5.10.0/lib/5.10.0/darwin-2level/Time/HiRes.pm
    Installed: 1.9711
    CPAN:      1.9719  Not up to date
    Andrew Main (Zefram) (ZEFRAM)
    [email protected]

It even works on modules that you haven't installed:

$ cpan -D Win32::Process
Win32::Process
-------------------------------------------------------------------------
    Interface to Win32 Process functions
    J/JD/JDB/Win32-Process-0.14.tar.gz
    Installed: 
    CPAN:      0.14  Not up to date
    Jan Dubois (JDB)
    [email protected]

I think maybe I need an XML option like svn.

brian d foy 2009-10-13 07:05:59

But, just everything THAT on CPAN.

Galaxy 2009-10-13 07:32:01

I don't understand your comment.

brian d foy 2009-10-13 08:15:17

What if you write a package such as FOO::Bar and put it in `PERL5LIB` ?

Galaxy 2009-10-13 10:28:42

@Galaxy: it's kind of like asking "what happens if I cut my leg off with a hacksaw". You won't have a leg anymore. Duhhh.

jrockway 2010-04-09 03:21:45

Answer 4

A:

I use the script from http://www.perlmonks.org/?node%5Fid=697155

It gives you a page that you can search your @INC by a string, and outputs module information, version number, file location, and links to the appropriate CPAN page.

Oesor 2009-10-13 14:09:57

Answer 5

A:

If need to find which modules are actually used by your script you can use perl debuggers M command:

[ivan@server ~]$ perl -d your_script.pl
...

Debugged program terminated.  Use q to quit or R to restart,
  use o inhibit_exit to avoid stopping after program termination,
  h q, h R or h o to get additional info.

DB M
'AutoLoader.pm' => '5.60 from /usr/lib/perl5/5.8.8/AutoLoader.pm'
'Carp.pm' => '1.04 from /usr/lib/perl5/5.8.8/Carp.pm'
...

This will help in case when you have modules with same names but in different folder.

Ivan Nevostruev 2009-10-13 16:30:28

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How can I find out where a Perl module is installed?

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