test_controller.rb

gistfile1.txt

class TestController < ApplicationController
  def rubyversion
    text = `which ruby`
    text += "<br>"
    text += "<br>"
    text += `ruby --version`
    text += "<br>"
    text += "<br>"
    text += `gem list --local`.split("\n").join("<br>")
    render :text => text
  end
end