I've found the shell script by jhourcle at Re: Which module did I load? very helpful. It not only tells you which of multiple copies in your @INC path is the module perl is using, it gives you the version number and the other modules that will be loaded with it. Here's his sample invocation and partial output, copied from the node in the link. 
$ 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
             ...

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In reply to Re: Module installed Path by rodion
in thread Module installed Path by rose

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