How to install Ruby, Git, Rails, PostgreSQL and MySQL on Ubuntu

railsInstaller.sh

#!/bin/sh

# System update
sudo apt-get update

# Curl
sudo apt-get -y install curl

# Git
sudo apt-get -y install git-core

# NodeJS
sudo apt-get -y install python-software-properties python g++ make
sudo add-apt-repository -y ppa:chris-lea/node.js
sudo apt-get update
sudo apt-get -y install nodejs

# PostgreSQL
sudo apt-get -y install postgresql libpq-dev

# RVM
curl -L get.rvm.io | bash -s stable
source ~/.profile
source ~/.rvm/scripts/rvm
rvm autolibs enable
rvm requirements

# Ruby
rvm install ruby --default

# Avoid "File not found: lib" error
gem install rdoc

# Rails
gem install rails

I've updated the script :)