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The first time ssh-copy-id it will ask
# ssh-copy-id -i .ssh/id_dsa.pub backup@example.com
The authenticity of host 'example.com (xxx.xxx.xxx.xxx)' can't be established.
RSA key fingerprint is 39:fb:5e:70:30:33:2b:18:17:e9:4f:2f:91:b5:d2:21.
Are you sure you want to continue connecting (yes/no)?
Is it possible to script this, so the script just will answer yes?
If your ssh-copy-id doesn't support the StrictHostKeyChecking option, you can write a script that does:
ssh-keyscan against the target server to get the public keyssh-copy-idSSH has an option to automatically add any host keys to the trusted hosts file:
ssh-copy-id -i .ssh/id_dsa.pub -o StrictHostKeyChecking=no backup@example.com
As an alternative, you could do the following:
echo "yes \n" | ssh-copy-id -i .ssh/id_dsa.pub backup@example.com
Edit: since it appears these solutions don't work with ssh-copy-id, you could always create a ~/.ssh/config file with the following option in it:
StrictHostKeyChecking no
This should work with all SSH connections, regardless if they are invoked through a script or not.
ssh-copy-id is a script. You can modify it to add -o StrictHostKeyChecking=no or disable that parameter in the ssh_config file.
ssh-copy-id servername works fine.
sudo sed -i.bak 's/ssh \$/ssh -o StrictHostKeyChecking=no \$/' $(which ssh-copy-id).
This was from a decade ago, but is still a relevant question and doesn't have a functional answer:
ssh-copy-id -i .ssh/id_dsa.pub backup@example.com <<< yes
You will still need to enter your password.
Just in case someone else stumbles across this old post.
Try this:
ssh-copy-id -i ~/.ssh/id_rsa.pub user@example.com -y
it does not add the host keys to the known_hosts file but lets you copy (or append) the public key to the authorized_keys that you want to, if that is the sole purpose here.
