install rbenv global

install_rbenv.md

# git clone https://github.com/rbenv/rbenv.git /usr/local/rbenv
# git clone https://github.com/rbenv/ruby-build.git /usr/local/rbenv/plugins/ruby-build

# vi /etc/profile.d/rbenv.sh
export RBENV_ROOT=/usr/local/rbenv
export PATH=${RBENV_ROOT}/bin:$PATH
eval "$(rbenv init --no-rehash -)"

# source /etc/profile.d/rbenv.sh
# visudo
Defaults env_keep += "RBENV_ROOT"
Defaults secure_path = /sbin:/bin:/usr/sbin:/usr/bin:/usr/local/rbenv/bin:/usr/local/rbenv/shims

# RUBY_VERSION=1.9.3-p551 
# BUNDLER_VERSION=1.0.18
# rbenv install -v $RUBY_VERSION
# rbenv rehash
# rbenv global  $RUBY_VERSION
# rbenv versions
# ruby -v
# which ruby
# gem install --no-ri --no-rdoc  bundler -v $BUNDLER_VERSION
# rbenv rehash