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To make it more convenient for users who use multiple terminal sessions simultaneously, SSH can reuse an existing connection if connecting from Linux or Mac.  After the initial login, subsequent terminals can use that connection, eliminating the need to enter the username and password each time for every connection.  To enable this feature, add the following lines to your ~/.ssh/config file:

~/.ssh/config
Host *
ControlMaster auto
ControlPath /tmp/%r@%h:%p
ControlPersist 2h

You may not have an existing ~/.ssh/config. If not, simply create the file and set the permissions appropriately first: touch ~/.ssh/config && chmod 600 ~/.ssh/config

This will enable connection reuse when connecting to any host via SSH or SCP.  

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