Hi everyone! I'm the developer of a clipboard manager that I know many of us Linux users here might know, called just The Clipboard Project.
I've spent the past couple months working on a bunch of speed optimizations, little fixes, and a really cool new feature for Linux only: asynchronous X11/Wayland clipboard synchronization. What that means is that you can copy stuff in the background and your CB clipboard will pick it all up automatically.
If that sounds awesome, then you can get the brand-spanking-new 0.8.2 version at https://github.com/Slackadays/Clipboard or this post's link (thanks, Lemmy!)
Well, if you just have two windows going to two different terminals, whatever text you select in one you can just copy to the other usually with Ctrl+SHIFT+C and Ctrl+SHIFT+V, and my clipboard manager lets you do the same even for large amounts of text you can't select. Therefore, all you'd need a specific setup for is if you want to do this action automatically with a single button press, like an Excel macro. I hope this helps! :)
I think they meant TTYs