Show command history "picture-in-picture" when teaching command line. Requires Bash.

Motivation for this:

• This is nice for people using a tiling window manager
• Only two commands to run, I guess could be collapsed to one
• Only one terminal to deal with
• Less for me to do and prepare before the lesson starts

wget https://raw.githubusercontent.com/bast/history-window/main/history-window.sh
source history-window.sh

The nice thing is that it does not install or modify anything permanently. Once you close the terminal, it's gone. Only thing left behind might be:

• history-window.sh which we downloaded
• ~/history.txt which is the history file written to by the script

• There are rough edges. Improvements are welcome.
• Resizing kind of works, but requires a clear to redraw the window.
• Currently only Bash. Let's add support for fish?

• https://github.com/rkdarst/prompt-log