Install ruby and rails - simplest procedure for Ubuntu OS

install_ruby_on_rails.sh

#!/bin/bash
sudo apt install build-essential ruby liblzma-dev patch ruby-dev zlib1g-dev libsqlite3-dev nodejs
sudo gem update --system
sudo gem install bundler
sudo gem install nokogiri -v 1.8.2
sudo gem install rails -v 5.2.0
sudo gem install sqlite3 -v 1.3.13
sudo gem install execjs

# To create an app inside a directory, 
# $rails _5.2.0_ new hello_app
# and when asked, provide password to run with sudo command