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You can multiplex your SSH session and have several ssh commands running on the same connection (without having to type the password/check the security key again). Check the ControlMaster option for SSH.

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And this is better than tmux... Why?

I use both. The primary reason for ControlMaster in my case is we use 2FA, and this way I only have to auth one connection.

Tmux is the UI for switching between ssh sessions sharing the connection.

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