It looks like you skipped step 2, rbenv init. rbenv is tightly integrated with your shell and some shims must be installed by you.

You can debug it with curl -fsSL https://github.com/rbenv/rbenv-installer/raw/main/bin/rbenv-doctor | bash

Answer from Schwern on Stack Overflow
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GitHub
github.com › rbenv › rbenv
GitHub - rbenv/rbenv: Manage your app's Ruby environment · GitHub
Set up your shell to load rbenv. ... Close your Terminal window and open a new one so your changes take effect. That's it! You are now ready to install some Ruby versions.
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Homebrew
formulae.brew.sh › formula › rbenv
rbenv — Homebrew Formulae
brew install rbenv · Ruby version manager · https://rbenv.org · License: MIT · Development: Pull requests · Formula JSON API: /api/formula/rbenv.json · Formula code: rbenv.rb on GitHub · Bottle (binary package) installation support provided.
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Schlink's Docs
sts10.github.io › docs › lubuntu › rbenv-on-lubuntu.html
Using Rbenv - Schlink's Docs
It suggested running apt-get install -y libreadline-dev so I did that (prefaced with sudo) and that software seemed to install successfully. On second attempt I ran rbenv install --verbose 2.3.3 so that I could better see what’s going on (turns out, it’s a lot!).
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Ruby
ruby-lang.org › en › documentation › installation
Installing Ruby | Ruby
If you are planning to use RVM as a version manager you don’t need a separate installer, it comes with its own. ruby-build is a plugin for rbenv that allows you to compile and install different versions of Ruby. ruby-build can also be used as a standalone program without rbenv.
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DEV Community
dev.to › eclecticcoding › set-up-rbenv-revisited-4ngo
Set Up Rbenv Revisited - DEV Community
March 4, 2021 - To set up RBENV there is the default way: ... There is thankfully an easier install script. This script installs or updates rbenv on your system. If Homebrew is detected, installation will proceed using brew install/upgrade. Otherwise, rbenv ...
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Medium
medium.com › @norton.seanm › a-guide-to-using-rbenv-mac-4ca211b1c713
A Guide to using rbenv (Mac). Your ruby environment should be a… | by Sean Norton | Medium
April 22, 2019 - Note: that the code below also installs ruby-build, so you'll be ready to install other Ruby versions out of the box. ... 2. Initialize rbenv. Run $ rbenv init and follow the instructions to set up rbenv integration with your shell.
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DigitalOcean
digitalocean.com › community › tutorials › how-to-install-ruby-on-rails-with-rbenv-on-ubuntu-20-04
How To Install Ruby on Rails with rbenv on Ubuntu 20.04 | DigitalOcean
September 1, 2022 - First, list all the available versions of Ruby: ... Output2.6.8 2.7.4 3.0.2 jruby-9.2.19.0 mruby-3.0.0 rbx-5.0 truffleruby-21.2.0.1 truffleruby+graalvm-21.2.0 Only latest stable releases for each Ruby implementation are shown. Use 'rbenv install --list-all / -L' to show all local versions.
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Bitnami
docs.bitnami.com › aws › infrastructure › ruby › get-started › understand-rbenv
Get started with rbenv
February 6, 2026 - rbenv is included in all installations of Bitnami Ruby stack that use system packages.
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DigitalOcean
digitalocean.com › community › tutorials › how-to-install-ruby-on-rails-with-rbenv-on-macos
How To Install Ruby on Rails with rbenv on macOS | DigitalOcean
December 1, 2022 - To download the rbenv package with Homebrew, run the following command: ... This will install rbenv and the [ruby-build] (https://github.com/rbenv/ruby-build) plugin. This plugin adds therbenv install command, which streamlines the installation process for new versions of Ruby.
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GitHub
github.com › rbenv › rbenv-installer
GitHub - rbenv/rbenv-installer: Installer and doctor scripts for rbenv · GitHub
The rbenv-installer script idempotently installs or updates rbenv on your system. If Homebrew is detected, installation will proceed using brew install/upgrade.
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Languages   Shell
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Albertogrespan
albertogrespan.com › blog › installing-ruby-the-right-way-on-os-x-using-rbenv
Installing Ruby the right way on OS X using rbenv – Alberto Grespan
May 13, 2014 - In this post I will show you why I’m using rbenv to handle my Rubies and I’ll include some really great plugins that had made my life easier. On a Mac as on a Linux machine you can install rbenv using git. To install it for a user just $ git clone https://github.com/sstephenson/rbenv.git ~/.rb...
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Devhints
devhints.io › ruby › rbenv cheatsheet
rbenv cheatsheet
One-page guide to rbenv: usage, examples, and more. rbenv lets you manage installations of multiple Ruby versions.
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Nurelm
nurelm.com › quickly-setup-your-ruby-environment-with-rbenv
Quickly Setup Your Ruby Environment With rbenv
Innovate with NuRelm. Learn how we partner with businesses and researchers alike to produce web applications, eCommerce and mobile solutions.
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GitHub
gist.github.com › pmkay › 8dc6f1a8ade2c1e821855624c71c8d0f
Setting up and installing rbenv, ruby-build, rubies, rbenv-gemset, and bundler · GitHub
Packages you’ll want installed in order for your rubies to configure to their fullest potential (apt packages): libssl-dev zlib1g-dev libreadline-dev libyaml-dev flex gettext · Find out which rubies are available. Wow, you can even tab-complete these: % rbenv install 1.8.7-p«tab» 1.8.7-p249 1.8.7-p302 1.8.7-p334 1.8.7-p352 1.8.7-p357 1.8.7-p358
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Hibbard
hibbard.eu › how-to-install-rbenv-on-linux-mint-17-1
How to Install rbenv on Linux Mint 17.1 · James Hibbard
After that, add rbenv init to your shell to enable shims and autocompletion: ... Congratulations! You have now successfully installed rbenv.
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DigitalOcean
digitalocean.com › community › tutorial-collections › how-to-install-ruby-on-rails-with-rbenv
How To Install Ruby on Rails with rbenv | DigitalOcean
Ruby on Rails is one of the most popular application stacks for developers looking to create sites and web apps. The Ruby programming language, combined with the Rails development framework, makes app development simple. This tutorial will take you through the Ruby and Rails installation process with the command line tool rbenv.
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Better Stack
betterstack.com › community › guides › scaling-ruby › rbenv-explained
Getting Started with rbenv | Better Stack Community
September 30, 2025 - Easily manage multiple Ruby versions with rbenv. This guide shows you how to install, configure, and use rbenv for seamless version switching and Bundler integration.
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Programming Zen
programmingzen.com › home › installing rbenv on zsh (on macos)
Installing rbenv on Zsh (on MacOS) | Programming Zen
November 12, 2020 - In this quick article, I show you how to install rbenv on Zsh on MacOS. The process is fairly straightfoward once you know all the steps.