rvm

A tool for easily installing, managing, and working with multiple ruby environments. More information: https://rvm.io.

• Install one or more space-separated versions of Ruby:
  rvm install {{version(s)}}
• Display a list of installed versions:
  rvm list
• Use a specific version of Ruby:
  rvm use {{version}}
• Set the default Ruby version:
  rvm --default use {{version}}
• Upgrade a version of Ruby to a new version:
  rvm upgrade {{current_version}} {{new_version}}
• Uninstall a version of Ruby and keep its sources:
  rvm uninstall {{version}}
• Remove a version of Ruby and its sources:
  rvm remove {{version}}
• Show specific dependencies for your OS:
  rvm requirements