====== ssh keychain ======
  * [[linux:ssh|Linux SSH]] keychain
  * [[https://manpages.ubuntu.com/manpages/xenial/man1/keychain.1.html|Ubuntu Manpage: keychain - re-use ssh-agent and/or gpg-agent between logins]]
  * [[https://www.cyberciti.biz/faq/ubuntu-debian-linux-server-install-keychain-apt-get-command/|Ubuntu / Debian Linux Install Keychain SSH Key Manager For OpenSSH - nixCraft]]