An administrator has generated an SSH key pair and now needs to distribute the public key to several servers. The goal is to append the key to each user’s existing authorized_keys file without manual copying or file editing. Which utility best accomplishes this task?
ssh-add ~/.ssh/id_rsa.pub
ssh-copy-id user@remote-host
scp /.ssh/id_rsa.pub user@remote-host:/.ssh/authorized_keys
ssh-keygen -t rsa
ssh-copy-id connects to the target host using the administrator's credentials and appends the local public key to ~/.ssh/authorized_keys automatically, preserving any existing keys. Using scp to copy the key risks overwriting or misplacing permissions. ssh-add only loads a private key into the local SSH agent. ssh-keygen only creates key pairs and does not handle key distribution.
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