rbenv
rbenv is a Ruby version management tool.
It can be installed on MacOS using Homebrew
shell
brew install rbenv ruby-build
# After installation, this will tell you how to complete setup.
rbenv initUsage
shell
# List available versions
rbenv install -l
# Install a Ruby version
rbenv install 1.2.3
# Set the Ruby version globally
rbenv global 1.2.3
# Set the Ruby version for this directory
rbenv local 1.2.3