How to setup `rbenv` on Fedora 42

This guide will not install a specific Ruby version you want, although, it will setup rbenv so you can manage multiple Ruby versions.

It assumes that the project that requires a specific Ruby version has a file .ruby-version in the root of the project. So, simply running rbenv install from project root directory will use the version specified in that file and install it.

But if you still want to install a specific version of Ruby without using .ruby-version file, you can do so using:

$ rbenv install 3.4.1

1. Installing `rbenv`

Fedora has an official package which you can install:
```
sudo dnf install rbenv
```
Set up your shell to load rbenv:
```
rbenv init
```
Close your Terminal window and open a new one so your changes take effect.

2. Installing Ruby

Let's say, you are in the root of your project directory (my_app) and a file .ruby-version exists with the following version:

# my_app/.ruby-version
3.4.1

Now, running the following command will automatically look for the version specified in .ruby-version and install it:

$ rbenv install

3. Verifying Ruby version

From your project directory (my_app), run the following command to verify the version rbenv is currently using for this project among other rubies you have previously installed (if any):

$ rbenv versions
  3.4.0
* 3.4.1 (set by /home/ammar/workspace/projects/my_app/.ruby-version)

The asterisk (*) in the above output indicates the currently active version.

Bonus

Setting a specific Ruby version as global

$ rbenv global 3.4.1

Setting a specific Ruby version in current shell (temporary)

$ rbenv shell 3.4.1

Removing a specific Ruby version

To remove old Ruby versions, simply rm -rf the directory of the version you want to remove. You can find the directory of a particular Ruby version with the rbenv prefix command, e.g. rbenv prefix 3.4.0.

$ rbenv versions
  3.4.0
  3.4.1

$ rbenv prefix 3.4.0
/home/ammar/.rbenv/versions/3.4.0

$ rm -rf /home/ammar/.rbenv/versions/3.4.0

$ rbenv versions
  3.4.1

ammarshah/manage_multiple_ruby_versions_with_rbenv_in_fedora.md

How to setup rbenv on Fedora 42

1. Installing rbenv