Install RBEnv on EC2

RBEnvEC2.sh

# Become sudo
sudo su -

# Update
yum update

# Install git for RBEnv and gcc for Ruby.
yum install git gcc

git clone git://github.com/sstephenson/rbenv.git /usr/local/rbenv

# Create /etc/profile.d/rbenv.sh
touch /etc/profile.d/rbenv.sh
cat <<EOF > /etc/profile.d/rbenv.sh
export RBENV_ROOT=/usr/local/rbenv
export PATH="${RBENV_ROOT}/bin:$PATH"
eval "$(rbenv init -)"
EOF

. /etc/profile
# Download rubybuild
git clone https://github.com/sstephenson/ruby-build.git /usr/local/rbenv/plugins/ruby-build

# Now install Ruby.
rbenv install 2.0.0-p353
rbenv global 2.0.0-p353
rbenv rehash