The process to get a full working rbenv setup.

Install RBenv.bash

export RBENV_ROOT="$HOME/.rbenv"
export RBENV_PLUGINS="$RBENV_ROOT/plugins"

git clone https://github.com/sstephenson/rbenv.git "$RBENV_ROOT"

export PATH="$RBENV_ROOT/bin:$PATH"
echo 'export PATH="$RBENV_ROOT/bin:$PATH"' >> ~/.bash_profile

eval "$(rbenv init -)"
echo 'eval "$(rbenv init -)"' >> ~/.bash_profile

cat << EOF > $RBENV_ROOT/default-gems
gem-browse
pry
pry-doc
pry-theme
pry-coolline
pry-byebug
pry-toys
pry-inline
pry-state
bundler
rubygems-bundler
EOF

mkdir -p $RBENV_PLUGINS

git clone https://github.com/sstephenson/rbenv-gem-rehash.git   $RBENV_PLUGINS/rbenv-gem-rehash
git clone https://github.com/sstephenson/ruby-build.git         $RBENV_PLUGINS/ruby-build
git clone https://github.com/sstephenson/rbenv-default-gems.git $RBENV_PLUGINS/rbenv-default-gems
git clone https://github.com/rkh/rbenv-update.git               $RBENV_PLUGINS/rbenv-update
git clone https://github.com/rkh/rbenv-whatis.git               $RBENV_PLUGINS/rbenv-whatis
git clone https://github.com/rkh/rbenv-use.git                  $RBENV_PLUGINS/rbenv-use
git clone https://github.com/tpope/rbenv-aliases.git            $RBENV_PLUGINS/rbenv-aliases
git clone https://github.com/tpope/rbenv-communal-gems.git      $RBENV_PLUGINS/rbenv-communal-gems
git clone https://github.com/nicknovitski/rbenv-gem-update      $RBENV_PLUGINS/rbenv-gem-update
#git clone https://github.com/jf/rbenv-gemset.git                $RBENV_PLUGINS/rbenv-gemset

# OSX: xcode-select --install
# OSX: brew install openssl libyaml libffi
# Linux: apt-get install autoconf bison build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev \
# Linux: libncurses5-dev libffi-dev libgdbm3 libgdbm-dev

rbenv update
rbenv install 2.2.3
rbenv alias --auto
rbenv use 2.2.3 --global
rbenv communize --all
gem regenerate_binstubs