Ubuntu install ruby on rails environment

ubuntu-rails.sh

#!/bin/bash

## Exit trap
trap 'ret=$?; test $ret -ne 0 && printf "failed\n\n" >&2; exit $ret' EXIT

set -e

## Fancy echo
fancy_echo() {
  printf "\n%b\n" "$1"
} 

## Debian-Ubuntu package update
fancy_echo "Updating system packages ..."
  sudo apt-get update
 

## Extra components
fancy_echo "Installing ImageMagick, to crop and resize images ..."
  sudo apt-get install -y imagemagick

fancy_echo "Installing libraries for common gem dependencies ..."
  sudo apt-get install libxslt1-dev libcurl4-openssl-dev libksba8 libksba-dev libqtwebkit-dev libreadline-dev libpq-dev

fancy_echo "Installing watch, to execute a program periodically and show the output ..."
  sudo apt-get install watch

fancy_echo "Installing NodeJS, a Javascript runtime ..."
  sudo apt-get install nodejs

## Rbenv
if [[ ! -d "$HOME/.rbenv" ]]; then
  fancy_echo "Installing rbenv, to change Ruby versions ..."
    git clone git://github.com/sstephenson/rbenv.git ~/.rbenv

    if ! grep -qs "rbenv init" ~/.zshrc; then
      echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.zshrc

      echo 'eval "$(rbenv init - --no-rehash)"' >> ~/.zshrc
    fi

    export PATH="$HOME/.rbenv/bin:$PATH"
    eval "$(rbenv init -)"
fi

if [[ ! -d "$HOME/.rbenv/plugins/rbenv-gem-rehash" ]]; then
  fancy_echo "Installing rbenv-gem-rehash so the shell automatically picks up binaries after installing gems with binaries..."
    git clone https://github.com/sstephenson/rbenv-gem-rehash.git ~/.rbenv/plugins/rbenv-gem-rehash
fi

if [[ ! -d "$HOME/.rbenv/plugins/ruby-build" ]]; then
  fancy_echo "Installing ruby-build, to install Rubies ..."
    git clone git://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build
fi

## Ruby dependencies
fancy_echo "Installing Ruby dependencies ..."
  sudo apt-get install zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev

## Ruby environment
RUBY_VERSION="2.1.2"

fancy_echo "Preveting gem system from installing documentation ..."
  echo 'gem: --no-ri --no-doc' >> ~/.gemrc

fancy_echo "Installing Ruby $RUBY_VERSION ..."
  rbenv install $RUBY_VERSION

fancy_echo "Setting $RUBY_VERSION as global default Ruby ..."
  rbenv global $RUBY_VERSION
  rbenv rehash

fancy_echo "Updating to latest Rubygems version ..."
  gem update --system

fancy_echo "Installing Rails ..."
  gem install rails

fancy_echo "Installing PostgreSQL Ruby interface ..."
  gem install pg

Run on terminal:
bash <(curl -s https://gist.githubusercontent.com/ismailakbudak/89923b7d8138c50ecaef/raw/ad2e0ba49ef9f0203a14b127b943cdb3c2e1700e/ubuntu-rails.sh)