ssh-agent
A program to hold private keys used for public key authentication
Summary
The ssh-agent is a helper program that keeps track of user's 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. This implements a form of single sign-on (SSO).
The SSH agent is used for SSH public key authentication. It uses SSH keys for authentication. Users can create SSH keys using the ssh-keygen command and install them on servers using the ssh-copy-id command.
Reference
ssh.com Docs
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