Instead of using the build-in software package for Ruby of your operating system, we will use rbenv which lets you switch between multiple versions of Ruby.
First, we need to use git to get the current version of rbenv:
{: lang="bash" }
$ cd
In case you shouldn't want to use git, you can also download the latest version as a zip file from Github.
You need to add the directory that contains rbenv to your $PATH environment variable. If you are on Mac, you have to
replace .bashrc with .bash_profile in all of the following commands):
{: lang="bash" } $ echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc
To enable auto completion for rbenv commands, we need to perform the following command:
{: lang="bash" } $ echo 'eval "$(rbenv init -)"' >> ~/.bashrc
Next, we need to restart our shell to enable the last changes:
{: lang="bash" } $ exec $SHELL
Basically, there are two ways to install different versions of Ruby: You can compile Ruby on your own and try to manage the versions and gems on your own, or you use a tool that helps you.
ruby-build
Because we don't want to download and compile different Ruby versions on our own, we will use the ruby-build plugin for rbenv:
{: lang="bash" } $ mkdir ~/.rbenv/plugins $ cd ~/.rbenv/plugins $ git clone git://github.com/sstephenson/ruby-build.git
If you now run rbenv install you can see all the different Ruby version you can install and use for different Ruby
projects. We are going to install ruby 1.9.3-p392:
{: lang="bash" } $ rbenv install 1.9.3-p392
This command will take a couple of minutes, so it's best to grab a Raider, which is now known as
Twix. After everything runs fine, you have to run rbenv rehash to rebuild
the internal rbenv libraries. The last step is to make Ruby 1.9.3-p392 the current executable on your machine:
{: lang="bash" } $ rbenv global 1.9.3-p392
Check that the correct executable is active by exexuting ruby -v. The output should look like:
{: lang="bash" } $ 1.9.3-p392 (set by /home/.rbenv/versions)
Now you are a ready to hack on with Padrino!
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