how to open ruby console

1. Open a terminal window.

2. Type irb and press Enter.

3. The Ruby console (IRB) will start, and you will see a prompt indicating that you are now in interactive Ruby mode.

4. You can start entering Ruby code directly in the console. Press Enter to execute the code.

5. To exit the Ruby console, type exit and press Enter, or use the keyboard shortcut Ctrl + D.

Note: Make sure you have Ruby installed on your system before trying to open the Ruby console. If it's not installed, you can download and install it from the official Ruby website: https://www.ruby-lang.org/en/documentation/installation/