Install Ruby via rbenv (and ruby-build) on Ubuntu Linux

rbenv-install.sh

#!/bin/bash
#
# Purpose: install ruby + rbenv on Ubuntu Linux
VERSION="1.9.3-p327"

echo "[*] --> Updates packages lists." 1>&2
sudo apt-get update -y

echo "[*] --> Installs curl and GIT packages." 1>&2
sudo apt-get git-core curl -y

echo "[*] --> Installs ImageMagick for image processing." 1>&2
sudo apt-get install imagemagick --fix-missing -y

echo "[*] --> Installs Rails required packages." 1>&2
sudo apt-get install build-essential bison openssl curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-0 libsqlite3-dev sqlite3 libxml2-dev libxslt-dev autoco
nf libc6-dev nodejs -y

echo "[*] --> Installs rbenv." 1>&2
curl https://raw.github.com/fesplugas/rbenv-installer/master/bin/rbenv-installer | bash

echo "[*] --> Fix ~/.bash_profile." 1>&2
cat >> ${HOME}/.bash_profile <<DELIM
# ---[ RBENV start ]---
export RUBY_HEAP_MIN_SLOTS=1000000
export RUBY_HEAP_SLOTS_INCREMENT=1000000
export RUBY_HEAP_SLOTS_GROWTH_FACTOR=1
export RUBY_GC_MALLOC_LIMIT=100000000
export RUBY_HEAP_FREE_MIN=500000

export RBENV_ROOT="\${HOME}/.rbenv"

if [ -d "\${RBENV_ROOT}" ]; then
  export PATH="\${RBENV_ROOT}/bin:\${PATH}"
  eval "\$(rbenv init -)"
fi
# ---[ RBENV end ]---
DELIM
source ${HOME}/.bash_profile

echo "[*] --> Installs required Ubuntu packages." 1>&2
rbenv bootstrap-ubuntu-12-04
rbenv patch-ruby-build

echo "[*] --> Installs ruby-${VERSION}." 1>&2
curl https://raw.github.com/gist/1688857/2-${VERSION}-patched.sh > /tmp/${VERSION}
CFLAGS="-march=native -O3 -pipe -fomit-frame-pointer" rbenv install /tmp/${VERSION}
rbenv global ${VERSION}
rbenv rehash

echo "[*] --> Installs rake and bundler gems." 1>&2
rbenv bootstrap
rbenv rehash
gem install rb-readline foreman thin rails --no-rdoc --no-ri
rbenv rehash

echo "[*] --> Cleanup." 1>&2
rm -rf /tmp/${VERSION} /tmp/ruby-*

echo "[*] --> Installed:" 1>&2
echo -n "    - SQLine: " 1>&2
(sqlite3 --version | cut -d " " -f 1) 1>&2
echo -n "    - Ruby:   " 1>&2
(ruby -v | cut -d " " -f 2) 1>&2
echo -n "    - Rails:  " 1>&2
rails -v 1>&2
echo -e "[*] ---[ DONE ]---\n"

exit 0