Updating a hash using a refernece?

[AMORE,JUAN (HP-Roseville,ex1)]

How do I update the value pointed to by key "PAGER" from more to pg. 
when using a reference only to the hash element for key "PAGER".


%Unix= ("SHELL" => "/bin/csh", 
   "PAGER" => "more", 
   "DB" => "mysql");

 print "Value: ", $unix{PAGER}; 


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