How to send commands to nested tmux sessions

TL;DR : Press the prefix key twice

In this short blog post, we'll explore how to send tmux commands to a remote session while working within a local tmux session using the same prefix key.

That is, you have a local tmux session, you have connected to a remote host via ssh within this tmux session and now you have opened a new tmux session within that.

This scenario creates a "nested" tmux session. To send commands to the remote tmux session without changing the prefix key, you simply need to press the prefix key twice.

For example, if Ctrl + b is your prefix key, then press and hold Ctrl and then quickly press b twice.

That should be it