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I'm inside chroot, and everytime I scp it keeps telling me:

bash-4.2$ scp .
Could not create directory '/.ssh'.
Host key verification failed.

Obviously, I have no means to create "/.ssh" dir either, also I've tried to

export HOME=/private/

(Private dir is user only writable/readable) but it throws same error, that it can't create "/.ssh" so it doesn't even change the path it is trying to create, it always tries to create "/.ssh".

How can I ignore or change the "/.ssh" directory of scp/ssh commands?

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I think you could try to do

ssh -o "StrictHostKeyChecking no" -o "UserKnownHostsFile /dev/null" user@server

it could work as it won't try do check for a server key... (i have not try this myself)

(inspired from

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