Duplicate SSH session in Linux

Add 2 lines to /etc/ssh/ssh_config or to ~/.ssh/config:
ControlMaster auto
ControlPath ~/.ssh/socket-%r@%h:%p

You have to login for the first time, the first session will initiate a Control Master by creating a file at ~/.ssh indicate the login name, host and port. After that you can duplicate a ssh session by just execute a ssh command the same way you did for the first login, but this time password is not required.

Original is taken from here:

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