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Install rbenv for ubuntu

Clone the repo into a hidden home directory

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

Add ~/.rbenv/bin to your $PATH for access to the rbenv command-line utility

echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.profile

Add rbenv init to your shell to enable shims and autocompletion.

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

Restart your shell as a login shell so the path changes take effect. You can now begin using rbenv.

exec $SHELL -l

Install ruby-build, which provides an rbenv install command that simplifies the process of installing new Ruby versions.

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

This will install the latest development version of ruby-build into the ~/.rbenv/plugins/ruby-build directory. From that directory, you can check out a specific release tag. To update ruby-build, run git pull to download the latest changes.

rbenv install 1.9.3-p327

As an alternative, you can download and compile Ruby yourself into ~/.rbenv/versions/.

Rebuild the shim executables. You should do this any time you install a new Ruby executable (for example, when installing a new Ruby version, or when installing a gem that provides a command).

rbenv rehash
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