Greeter contract, greeter.greet() gives error greeter is not defined after re opening geth

I am new to ethereum,
I executed the greeter code [] in my private network and when I called greeter.greet() after mining. And it returned Hello world.
Later I closed my geth terminal and then re opened. This time greeter.greet() threw me an error greeter is not defined.

How do i call this greeter.greet() of my contract without redeploying?
How to permanently store this greeter variable in my geth ?
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