Installation

Install rbenv and ruby-build

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

Add to ~/.bash_profile

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

Verify installation

type rbenv   # → "rbenv is a function"

These are generic instructions; there may be rbenv packages available for your OS.

See: Installation

Managing versions

Command	Description
rbenv install -l	List all available versions
—	—
rbenv install 2.2.1	Install Ruby 2.2.1
rbenv uninstall 2.2.1	Uninstall Ruby 2.2.1
—	—
rbenv versions	See installed versions
rbenv version	See current version
—	—
rbenv which <NAME>	Display path to executable
rbenv rehash	Re-write binstubs

Using versions

{: .-three-column}

Locally

Command	Description
rbenv local 2.2.2	Use Ruby 2.2.2 in project
rbenv local --unset	Undo above

Application-specific version numbers are stored in .ruby-version.

Globally

Command	Description
rbenv global 2.2.2	Use Ruby 2.2.2 globally
rbenv global --unset	Undo above

Global version numbers are stored in ~/.rbenv/version.

Shell

Command	Description
rbenv shell 2.2.2	Use Ruby 2.2.2 in shell
rbenv shell --unset	Undo above

Shell-local version numbers are stored as environment variables.

References

• rbenv project page (github.com)
• rbenv ubuntu server cheatsheet (gist.github.com)