install rbenv, some rbenv plugins, bundler, chef, berkshelf & foodcritic note: deinstall rvm before start. execute step by step.

.gemrc

install: --no-rdoc --no-ri 
update: --no-rdoc --no-ri 

fast-rbenv.sh

# deinstall rvm (if installed)
$ rvm implode

# remove ruby packages 
apt-get update
apt-cache search libruby

# example remove ruby
sudo apt-get --purge remove libruby1.8 libruby1.9.1 ruby ruby1.8 ruby1.8-dev ruby1.9.1

# needed packages (further on)
sudo apt-get install build-essential \
    libreadline-dev \
    libssl-dev \
    zlib1g-dev \
    libxslt-dev \
    libxml2-dev


# install rbenv
git clone git://github.com/sstephenson/rbenv.git ~/.rbenv

# set PATH
echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc
echo 'eval "$(rbenv init -)"' >> ~/.bashrc

# load PATH
source ~/.bashrc

# open new shell
exec $SHELL -l

# plugins: https://github.com/sstephenson/rbenv/wiki/Plugins

# remove plugin "carsomyr/rbenv-bundler" if previous installed.
rm -rf ~/.rbenv/plugins/bundler

# install plugin: rbenv-update plugin
git clone https://github.com/rkh/rbenv-update.git ~/.rbenv/plugins/rbenv-update
rbenv update

# install plugin: ruby-build
git clone git://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build

# install plugin: rbenv-gem-rehash
git clone https://github.com/sstephenson/rbenv-gem-rehash.git ~/.rbenv/plugins/rbenv-gem-rehash


# list all available versions:
$ rbenv install -l

# install ruby version
$ rbenv install 1.9.3-p448
$ rbenv rehash

$ rbenv shell 1.9.3-p448
$ rbenv global 1.9.3-p448
$ rbenv rehash

# show rbenv versions
$ rbenv versions

$ ruby -v

# do NOT use sudo for gem install

# update RubyGems system
$ gem update --system

# list gems installed
$ gem query --local

# update existing gems (if you are upgrading)
$ gem update

$ rbenv rehash

# bundler
$ gem install bundler


# install binstubs plugin
$ git clone https://github.com/ianheggie/rbenv-binstubs.git ~/.rbenv/plugins/rbenv-binstubs

# binstubs usage; (not needed in this tutorial).
$ cd application-directory
$ bundle install --binstubs .bundle/bin

# berkshelf 
$ gem install berkshelf

# foodcritic
$ gem install foodcritic

# chef
$ gem install chef

# pry
$ gem install pry

# if fails with doc error
#gem install pry --no-rdoc --no-ri

# cucumber-chef
$ gem install cucumber-chef