Install Ruby on Rails (ROR) on Ubuntu 14.04

install_ruby_on_rails.md

1. Install some dependencies for Ruby.

sudo apt-get update
sudo apt-get install git-core curl zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev libcurl4-openssl-dev python-software-properties libffi-dev

2. using rbenv(recommended : Ruby Environment). Since there are other methods also.

git clone git://github.com/sstephenson/rbenv.git .rbenv
echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc
echo 'eval "$(rbenv init -)"' >> ~/.bashrc
exec $SHELL
git clone git://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build
echo 'export PATH="$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.bashrc
exec $SHELL
git clone https://github.com/sstephenson/rbenv-gem-rehash.git ~/.rbenv/plugins/rbenv-gem-rehash
rbenv install 2.2.2
rbenv global 2.2.2
ruby -v

3. Install rails gem.

Installing rails gem requires node.js. To install node.js, we're going to add it using a PPA repository:

sudo add-apt-repository ppa:chris-lea/node.js
sudo apt-get update
sudo apt-get install nodejs

Now install rails :

gem install rails -v 4.2.0

4. If you're using rbenv, you'll need to run the following command to make the rails executable available.

rbenv rehash