How are you executing the script that you write? If it's a completely separate process, it can't access the object that created it.
If you're using do or require, you can make $self a kind of global that the script can access.
If you fork and execute the separate process, it has access to everything that was there at the time of the fork. This is a slightly modified case of one of the above, but it's important to note that the object in the child will not be the same as the one that wrote the script. Rather, it will be a copy. It can do the same things, but it can't modify the original.
In answer to the question you asked, have a look at Devel::Pointer.
For a more detailed answer, I think you'll have to show us some code.
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