Quote:
Originally Posted by Mike Kostousov
Yes. I don't think, that system will waste 4KB, but to check first is a good way for copying key. But the best - to check existance authorized_key, if it exsits, to check that it doesn't contain id_rsa.pub etc. But it was quick way 
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Your way works and isn't wasting 4kb.
Did you know scp isn't working? dropbear needs an scp handler to actually do inbound scp...