I found this on Google. this perl oneliner will list all the installed modules on your system (Linux). then you can grep for whatever module your are looking for. 

perl -MFile::Find=find -MFile::Spec::Functions -Tlwe 'find { wanted =>
+ sub { print canonpath $_ if /\.pm\z/ }, no_chdir => 1 }, @INC'

[download]

In reply to Re^2: how to determine whether a module is installed or not? by slayedbylucifer
in thread how to determine whether a module is installed or not? by Anonymous Monk

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