SSH

• To Kill Hung up SSH Session Press: Enter Tilde(.) Fullstop (.)

https://www.cyberciti.biz/faq/openssh-linux-unix-osx-kill-hung-ssh-session/

• To password protect your private key:

ssh-keygen -p -f /Users/user/.ssh/id_rsa

• To make ssh-agent remember your password:

ssh-add ~/.ssh/id_rsa