Perl always expects each :: in a module name to translate to a path separator in the directory hierarchy. So for the module Script::Singleton it will look for the file Singleton.pm in a subdirectory named Script underneath one of the directories specified in @INC.

So if you want to reference it from /home/demo/pullWorkload/scpLRSIControllerDir/toys, you need to create /home/demo/pullWorkload/scpLRSIControllerDir/toys/Script (with mkdir), and put the file Singleton.pm in that directory.

I would recommend this as a temporary solution only. For CPAN modules it is almost always preferable to keep them in a separate place - see other people's suggestions for how to do that.

The handling of :: in module names is not trivial to find in the documentation. From perldoc -f use you will see that use Script::Singleton; is exactly equivalent to BEGIN { require Script::Singleton; Script::Singleton->import(); }. You then need to understand that since Script::Singleton is not in quotes, it is what perl calls a "bareword", and then find the part of perldoc -f require that describes this:

            If EXPR is a bareword, "require" assumes a .pm extension a
+nd
            replaces "::" with "/" in the filename for you, to make it
+ easy to
            load standard modules.
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