How to Install Ruby on Ubuntu 20.04

How do I download Ruby on Ubuntu?
How do I install the latest version of Ruby on Ubuntu?
What is Ubuntu Ruby?
How do I download and install Ruby?
How do I find my ruby path?
How do I switch between versions of Ruby?
How do I start Ruby programming?
How do I run a Ruby script?
How do I upgrade Ruby in Rails app?
What is Ruby version file?
How do I downgrade Ruby Version?
How do I know if Ruby is installed Linux?

How do I download Ruby on Ubuntu?

Speaking of package managers, there are several ways to install Ruby. We can install and manage our installations with package managers or by using tools such as rbenv or rvm.
...
Install Ruby on Ubuntu with APT

Step 1: Open the Terminal application. ...
Step 2: Update APT. ...
Step 3: Install Ruby. ...
Step 4: Verify the installation.

How do I install the latest version of Ruby on Ubuntu?

To install Ruby from the default Ubuntu repositories, follow these steps:

First, update the packages index: sudo apt update.
Install Ruby by typing: sudo apt install ruby-full.
To verify that the installation it was successful run the following command which will print the Ruby version: ruby --version.

What is Ubuntu Ruby?

Ruby is the language behind the powerful Ruby on Rails framework. In this tutorial we will show you three different ways to install Ruby on Ubuntu 20.04: From the standard Ubuntu repositories. ... A script that allows you to have multiple Ruby versions installed on the same machine. Using RVM (ruby enVironment manager).

How do I download and install Ruby?

Installing Ruby Using the RubyInstaller Tool

Step 1: Download the RubyInstaller Tool. ...
Step 2: Run the Ruby Installer. ...
Step 3: Verify the Ruby Installation. ...
Step 1: Enable the Windows Linux Subsystem (WSL) ...
Step 2: Install Linux Distro. ...
Step 3: Update the Linux Subsystem. ...
Step 4: Install Ruby. ...
Step 5: Verify the Installation.

How do I find my ruby path?

Here are two simple ways to check for it.

In irb. Run irb and type: ...
From command line. Just type ruby -v. ...
In RVM. Are you using RVM? ...
In rbenv. Are you using rbenv? ...
Using which. Do you want to know where your ruby binary is installed? ...
Using gem env.

How do I switch between versions of Ruby?

If you choose rbenv :

Follow the all the installation and setup instructions.
Install ruby-build.
Run rbenv install x.x.x where x.x.x is the version (use rbenv install --list to see which ones are available.
Run rbenv global x.x.x to change your global Ruby version.

How do I start Ruby programming?

Follow these steps:

Open your Windows launch screen (or use the Start Menu).
Click the Start Command Prompt with Ruby program. ...
Change your location to the Developer Kit folder. ...
Use Ruby to set up more Ruby tools. ...
Enter the install command and wait for it to complete:

How do I run a Ruby script?

Run a script

Press Ctrl twice to invoke the Run Anything popup.
Type the ruby script. rb command and press Enter . ...
(Optional) To run scratch files or scripts outside the project root, hold down the Alt key before running the command (in this case, the dialog title is changed to Run in Context ).

How do I upgrade Ruby in Rails app?

For each version you need to do these steps:

Change the Rails version in the Gemfile.
gem update.
rails app:update.
Apply all changes from the upgrade guide.
Run your tests.
Fix all failing tests.
Fix all obsolete messages.

What is Ruby version file?

Many Ruby (or Rails) projects will include a simple .ruby-version file, which simply specifies a version number, for example: 2.4.2. Popular tools to help you manage your Ruby version are: Ruby Version Manager (RVM) rbenv.

How do I downgrade Ruby Version?

As others have mentioned, its hard to come up with exact solution, in general to downgrade or switch versions for a user:

Install Ruby 1.8.7 (or locate it on your system if you have it already)
Edit your .bash_profile or .bashrc file to update your $PATH so that the 1.8.7 executable is found first. ...
7/bin/ruby.

How do I know if Ruby is installed Linux?

One way open the terminal window (sometimes called a "shell" or "bash shell") is to select Applications > Accessories > Terminal. Run the command which ruby. If you see a path such as /usr/bin/ruby, Ruby is installed. If you don't see any response or get an error message, Ruby is not installed.