Examples

 %hash = ("router" => "10.23.0.1",
          "www" => "10.23.0.2");

 print "$hash{'router'}\n";
   # prints "10.23.0.1", and newline

 @some_list = keys %hash;
   # @some_list contains ("www", "router")

 @another_list = values %hash;
   # @another_list contains ("10.23.0.2",
   #                         "10.23.0.1")

 delete $hash{"www");
   # Leaves only one key in %hash: "router"