Setup Jekyll on macOS with brew and rbenv - See https://jekyllrb.com/docs/installation/#macOS

README.md

Type this into your Terminal.app:

curl https://gist.githubusercontent.com/DirtyF/5d2bde5c682101b7b5d90708ad333bf3/raw/bbac59647ac66016cf443caf7d48c6ae173ae57f/setup-rbenv.sh | bash

setup-rbenv.sh

#!/bin/bash

set -ex
brew update
brew install rbenv ruby-build
rbenv install 2.4.3
rbenv global 2.4.3
ruby -v
gem install jekyll bundler
rbenv rehash

if ! type rbenv | grep function; then
  echo 'if which rbenv > /dev/null; then eval "$(rbenv init -)"; fi' >> ~/.bash_profile
fi

set +x
echo "Done! Close and reopen your terminal"