judas-christ

# install homebrew
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

# install cscreen
brew cask install cscreen

# list displays
cscreen -l
# find your external screen in the list and write the number (not the ID) down somewhere
# in the following instructions, use that number instead of <SCREEN>