Follow the steps given below for installing Ruby on Rails.
Step 1: Check Ruby Version
First, check if you already have Ruby installed. Open the command prompt and type ruby -v. If Ruby responds, and if it shows a version number at or above 2.2.2, then type gem --version. If you don't get an error, skip Install Ruby step. Otherwise, we'll install a fresh Ruby.
Step 2: Install Ruby
If Ruby is not installed, then download an installation package from rubyinstaller.org. Follow the download link, and run the resulting installer. This is an exe file rubyinstaller-2.2.2.x.exe and will be installed in a single click. It's a very small package, and you'll get RubyGems as well along with this package. Please check the Release Notes for more detail.
Step 3: Install Rails
Install Rails − With Rubygems loaded, you can install all of Rails and its dependencies using the following command through the command line −
C:\> gem install railsNote − The above command may take some time to install all dependencies. Make sure you are connected to the internet while installing gems dependencies.
Step 4: Check Rails Version
Use the following command to check the rails version.
C:\> rails -v
Output
Rails 4.2.4Source: Tutorialpoint