Not sure if it is useful to learn the imperative of these verbs by comparing them with their subjunctive forms as Jim rightly says they convey totally different things.
It doesn't follow the pattern in the case of savoir (See nous).
The imperative mood is used to give instruction or command or orders.
The subjunctive mood is used to indicate uncertainty / doubt / emotion / desire.
So given that it does not follow at least in the case of savoir (nous) then I would say that it does not mean that "these commands always use use the subjunctive"
Yes, nous sachons is the exception of the exception. Go figure! :)
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