How To Use Ruby In Terminal

Ruby is a powerful and versatile programming language used for various applications, from web development to scripting. In this blog post, we’ll explore how to use Ruby in the terminal for quick, simple tasks and for automating more complex processes. Ruby is not only a fantastic language for beginners, but it’s also a valuable tool for experienced developers. Let’s dive in!

Getting Started: Installing Ruby

Before we can start using Ruby in the terminal, you need to have Ruby installed on your machine. If you don’t have it installed already, you can follow the instructions on the official Ruby website for your specific operating system.

Running Ruby in Terminal

There are several ways to run Ruby code in the terminal, including running a Ruby script, executing a single line of Ruby code, and using Interactive Ruby (IRB). Let’s explore each of these methods in more detail.

Running a Ruby Script

To execute a Ruby script in the terminal, you’ll first need to create a file with the “.rb” extension. For example, create a file called hello_world.rb and add the following code to it:

puts 'Hello, World!'

Save the file, and then open your terminal. Navigate to the directory containing the hello_world.rb file and run the following command:

ruby hello_world.rb

The terminal will then execute the script and display the output: Hello, World!.

Executing a Single Line of Ruby Code

If you want to run a single line of Ruby code in your terminal without creating a script, you can use the -e flag followed by the code you want to execute. For example, to print “Hello, World!” in the terminal, run the following command:

ruby -e "puts 'Hello, World!'"

This method is useful for testing simple Ruby expressions or for quick, one-time tasks.

Using Interactive Ruby (IRB)

Interactive Ruby, or IRB, is a REPL (Read-Eval-Print Loop) that allows you to execute Ruby code interactively in the terminal. To start IRB, open your terminal and type irb followed by the Enter key. You’ll now be in the IRB environment, where you can type Ruby code and see the results immediately.

For example, you can type the following Ruby expression to calculate the sum of two numbers:

2 + 3

After pressing Enter, IRB will display the result: 5. To exit IRB, type exit and press Enter.


In this blog post, we’ve covered the basics of using Ruby in the terminal, from executing Ruby scripts and single lines of code to exploring the Interactive Ruby environment. By leveraging the power of Ruby in the terminal, you can streamline your development workflow and automate repetitive tasks with ease. So go ahead, give it a try and start exploring the world of Ruby at your fingertips!