Install Ruby and check the version

Install on Linux

On Debian and Ubuntu one package is enough for this course. Update the package list first, then install Ruby.

Update the package list

sudo apt update

Install Ruby

sudo apt install ruby

The package manager may install a slightly older Ruby than the newest release. That is fine for this course: every example works on Ruby 3.0 and newer.

ruby -v

Check what was installed with one short command:

Show the installed Ruby version

ruby -v

ruby 3.2.2 (2023-03-30 revision e51014f9c0) [x86_64-linux]

You will see the word ruby followed by the version number and build details. If the terminal answers command not found, the install step above did not finish.

Version managers

Later you may need several Ruby versions on one machine, for example an old project and a new one side by side. Version managers such as rbenv and rvm install Rubies into your home folder and switch between them per project.

You do not need a manager for this course, but it helps to recognize the command that lists installed versions:

List Rubies known to rbenv

rbenv versions

system
3.2.2

Your first gem command

Ruby ships with a tool called gem that installs shared libraries. Check that it works alongside Ruby:

Show the installed gem version

gem --version

3.4.10

Later lessons will use gem to add libraries such as test frameworks. For now the version number alone proves that the toolchain is ready.

Next: irb: the interactive shell

Article author: Arthur Isaev