Create SSH pair

ssh-keygen -f /home/thor/.ssh/maria

Copy public key to remote server

ssh-copy-id -i ~/.ssh/tatu-key-ecdsa user@host

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references:

1. How to Setup Passwordless SSH Login | Linuxize
2. Ssh-keygen is a tool for creating new authentication key pairs for SSH. This is a tutorial on its use, and covers several special use cases.