As far as I know this should create a hash reference

Yes that is correct.

What exactly means 'dereference to the LHS value'?

LHS = left hand side. I meant that the arrow operator takes a reference on the left, and dereferences it (ie. 'replaces' it with what it points to). You can then subscript it in various ways, with a key (for a hashref), an index (arrayref), parameters (coderef), or a method (object).

A hashref is not a hash, and thus you cannot access it directly. You need to first "fetch" the hash that it points to.

In reply to Re^5: Getting Getopt::Long values into a hash by fishbot_v2
in thread Getting Getopt::Long values into a hash by jeanluca

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