Multiple versions of ruby with rbenv

To install multiple versions of Ruby, you can use a version manager such as rbenv or chruby. (though, chruby often failed compilation of ruby on my M2 MacBook)

Here are the steps to install and use rbenv to manage multiple Ruby versions:

Install rbenv and the ruby-build plugin using Homebrew:

brew install rbenv ruby-build

Add the rbenv initialization commands to your shell configuration file (e.g. ~/.bash_profile or ~/.zshrc):

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

Restart your terminal to apply the changes.

Use the rbenv install command to install the desired Ruby versions:

rbenv install 3.2.0
rbenv install 2.6.6

Use the rbenv global command to set the default Ruby version:

rbenv global 2.7.2

Use the rbenv local command to set the Ruby version for a specific project:

cd myproject
rbenv local 2.6.6

To switch between Ruby versions, use the rbenv global command to set the desired version as the default, or use the rbenv local command to set the version for a specific project.

Alternatively, you can also use chruby to manage multiple Ruby versions. The steps to install and use chruby are similar to those for rbenv.

I hope this helps. Let me know if you have any questions or need further assistance.