Install rbenv and friends and update all of them when you want to ...
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README.md

README.md

rbenv installer

This tool is used to install rbenv and some plugins. It also provides scripts to install required software to be able to compile Ruby.

Installed plugins are rbenv-vars, ruby-build & rbenv-installer.

Before Installing

Install git and curl:

sudo apt-get -y install git-core curl

Install

Install rbenv and friends by running:

curl https://raw.github.com/fesplugas/rbenv-installer/master/bin/rbenv-installer | bash

Installing a Ruby

Install Ruby 1.9.3-p194 and make it global:

rbenv install 1.9.3-p194
rbenv global 1.9.3-p194

Updating

Update rbenv and plugins provided by the installer running:

rbenv update

Bootstrap

If you are installing rbenv in Ubuntu you'll probably need to install required packages first:

rbenv bootstrap-ubuntu-12-04
rbenv bootstrap-ubuntu-10-04

To update RubyGems and install bundler and rake:

rbenv bootstrap

About rbenv

rbenv source code is available at https://github.com/sstephenson/rbenv