ssh:tldr:4b38f

The command ssh-copy-id is used to copy the user's public key to a remote server, allowing passwordless authentication for future SSH connections.

Here is the breakdown of the command:

• ssh-copy-id: This is the main command that facilitates copying the public key to the remote server.
• -i ${path-to-certificate}: This option specifies the path to the user's public key certificate. The ${path-to-certificate} should be replaced with the actual path on your local machine.
• ${username}@${remote_host}: This represents the username and remote host where you wish to copy the public key. ${username} should be replaced with the desired username, and ${remote_host} should be replaced with the IP address or hostname of the remote server.

For example, if you have a certificate located at ~/.ssh/id_rsa.pub, and you want to copy it to the remote server with the username user1 and IP address 192.0.2.123, the command would look like this:

ssh-copy-id -i ~/.ssh/id_rsa.pub user1@192.0.2.123

Executing this command will prompt you for the password of the remote server's user. After providing the password, your public key will be appended to the ~/.ssh/authorized_keys file on the remote server. From that point onwards, you should be able to log in to the remote server via SSH without entering a password, using the corresponding private key stored on your local machine.