To manage Ruby installations, we can use rbenv to control what Ruby versions are used. For even simpler operation, there is the rbenv-installer to automate installation for rbenv and ruby-build:

# Download Ruby installer
> curl -fsSL https://github.com/rbenv/rbenv-installer/raw/HEAD/bin/rbenv-installer | bash

# See rbenv setup instructions with: '~/.rbenv/bin/rbenv init'
# Add rbenv to PATH
> echo 'export PATH="~/.rbenv/bin:$PATH"' >> ~/.bashrc
> echo 'eval "$(rbenv init - bash)"' >> ~/.bashrc
> source ~/.bashrc

# Install Ruby
> rbenv install -l
> rbenv install 3.1.2
> rbenv global 3.1.2