William Watson Goodwin, Syntax of the Moods and Tenses of the Greek Verb

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[*] 253. The imperative is sometimes used by the dramatists after οἶσθ᾽ ὅ and similar interrogative expressions, the imperative being really the verb of the relative clause.¹ The difficulty of translating such expressions is similar to that of translating relatives and interrogatives with participles. E.g. Ἀλλ᾽ οἶσθ᾽ ὃ δρᾶσον; τῷ σκέλει θένε τὴν πέτραν, “but do you know what you must do?—strike the rock with your leg!” AR. Av. 54. Οἶσθ᾽ ὅ μοι σύμπραξον; “ do you know what you must do for me?” EUR. Her. 451. Οἶσθά νυν ἅ μοι γενέσθω; δεσμὰ τοῖς ξένοισι πρόσθες, do you know what must be done for me?—put bonds on the strangers. Id. IT 1203. Οἶσθ᾽ ὡς ποίησον; do you know how you must act? SOPH. O.T. 543. (Compare EUR. Cyc. 131, “οἶσθ᾽ οὖν ὃ δράσεις;” do you know what you are to do?）

The English may use a relative with the imperative, as in which do at your peril. See HDT. i. 89, κάτισον φυλάκους, οἳ λεγόντων ὡς ἀναγκαίως ἔχει. So SOPH. O.C. 473.

A peculiar interrogative imperative is found in μὴ ἐξέστω; “ is it not to be allowed?” PLAT. Polit. 295E ; and ἐπανερωτὦ εἰ κείσθω, I ask whether it is to stand, Leg. 800E. (See 291.)