でないと as in the conditional phrase. 例：これをやれ。でないと殺す。
例えば、じゃないと？
Never heard of it though. If there is no such thing then is でないと even considered formal in the first place or just neutral if it doesn't have a casual/contracted form?
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1Hi, shoryuu! I've noticed that you add tags like kanji and kanji-choice to almost every question even though you've never asked a question related to kanji. Perhaps you might consider trying to find tags that fit your questions specifically? – snailplane♦ Dec 7 '17 at 15:37
There is the (Kanto) colloquial form 「でねえと」, but other than that, I don't think we have what you are looking for.
「じゃないと」 is different since it is the contracted form of 「ではないと」 and not of 「でないと」.
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Thank you. What is the meaning of ではないと though? Can't find any resources on it's uses. If you didn't make this distinction I would have probably thought the word is the same as でないと？ – shoryuu Dec 7 '17 at 15:23
I think that should be しないと though because you used やる, a verb, in the previous sentence, so you need to follow up with another verb.
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I think でないと often follows an imperative, actually. Maybe you can think of it as an elliptical form of （そう）でないと, meaning something like 'or else'. – snailplane♦ Dec 7 '17 at 16:51
