Is "you be queit" grammatically correct?

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I've heard some people say, "You be quiet!" Is this grammatically correct? What would be the verb in this sentence?

This is an imperative subject with an overt subject ('You') and the verb 'be' (in imperative form).

Mister Micawber, Is the verb "be" a bare infinitive, "to be"? thus, making this imperative sentence, "You have to be quiet". Or, is this something else? Since, "You have to be quiet " sounds less of an imperative?

Imperative mood uses the infinitive form of the verb, which is the same as 2nd person present indicative except for 'be'. 'You have to be quiet' is an indicative mood sentence; it is unrelated.

Right. It is indicative mood. Thanks a lot.