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Secure Shell (SSH) is a critical tool for anyone managing remote servers or automating tasks across machines. A key component of using SSH securely and efficiently is the setup of SSH keys that allow password-less authentication. This is where ssh-copy-id comes in - a utility that automates the installation of SSH keys on a remote server. Here, we'll explore how ssh-copy-id works, why you should use it, and how to install it across different Linux distributions using various package managers such as apt, dnf, and zypper. ssh-copy-id is a script that uses SSH to log into a remote machine (server, workstation) and append the indicated identity (SSH public key) to the remote machine's ~/.ssh/authorized_keys.