Install RVM then using it to install Ruby, RoR in CentOS 6.4 and Ubuntu 12.04

install_rvm_ruby_ror_in_cent_ubuntu.sh

#!/bin/bash
#
# This script will install RVM then use it to install RUBY, RAILS.
# Thanks for DigitalOcean awesome guides at:
# https://www.digitalocean.com/community/articles/how-to-install-ruby-on-rails-on-centos-6-with-rvm
# https://www.digitalocean.com/community/articles/how-to-install-ruby-on-rails-on-ubuntu-12-04-lts-precise-pangolin-with-rvm

# Detect which distro
DISTRO=`cat /etc/issue`

if [[ "$DISTRO" == *Ubuntu* ]]
then
  sudo apt-get update
  sudo apt-get install -y curl
elif [[ "$DISTRO" == *CentOS* ]]
then
  sudo yum update
  sudo yum install -y curl
fi

# download then install rvm
curl -L get.rvm.io | bash -s stable

# load the config and install dependencies
cat >> ~/.bashrc <<EOF
source ~/.rvm/scripts/rvm
EOF

source ~/.bashrc
rvm requirements

# install ruby 2.1
rvm install 2.1
rvm use 2.1 --default

# install gems
rvm rubygems current

# install rails
gem install rails

echo "
################### DONE ###################
Run 'ruby --version' to check if it ok.
"