Configure OpenSSH to reuse ssh connections

Configure ssh client (OpenSSH) to reuse connections:

Follow the following instructions https://stackoverflow.com/questions/20410252/how-to-reuse-an-ssh-connection and how to use them in https://en.wikibooks.org/wiki/OpenSSH/Cookbook/Multiplexing (ControlMaster)

See also

• OpenSSH (changelog): /etc/ssh/sshd_config | /etc/ssh/ssh_config | ~/.ssh/ | openSSL | sshd logs | sftp | scp | authorized_keys | ssh-keygen | ssh-keyscan | ssh-add | ssh-agent | ssh | Ssh -O stop | ssh-copy-id | CheckHostIP | UseKeychain, OpenSSF, ~/.ssh/authorized_keys