Simple bash script to toggle system preferences for Touchbar shows between "App controls" and "Show F1, F2, etc. Keys

toggleFunctionAppTouchbar.sh

 #!/bin/bash
function readCurrent(){
	local current=$(defaults read com.apple.touchbar.agent PresentationModeGlobal)
	echo "$current"
}

function setCurrent(){
	defaults write com.apple.touchbar.agent PresentationModeGlobal -string $1
	pkill "ControlStrip"
}

functionKeys=functionKeys
app=app
current=$(readCurrent)

if [[ "$current" == "$app" ]]; then
	setCurrent $functionKeys
elif [[ "$current" == "$functionKeys" ]]; then
	setCurrent $app
fi