Installing Ruby

Install a current Ruby

On macOS and Linux, use a version manager such as rbenv or asdf, or your package manager. On Windows, RubyInstaller is a common choice.

Check the version

Open a new terminal after installing.

ruby --version
gem --version

Open IRB

IRB is an interactive prompt for trying short snippets.

irb
>> 2 + 3
=> 5
>> exit

Install tips

• Prefer a version manager when you juggle multiple projects
• Reopen the terminal if commands are not found
• Bundler often ships with modern Ruby; check with bundle --version
• Editors with Ruby plugins make learning smoother