How to configure ssh-agent, agent forwarding, & agent protocol

The ssh-agent is a helper program that keeps track of users' identity keys and their passphrases. The agent can then use the keys to log into other servers without having the user type in a password or passphrase again.

Starting ssh-agent

On most Linux systems, ssh-agent is automatically configured and run at login, and no additional actions are required to use it.

eval `ssh-agent`