class WelcomeController < ApplicationController
    def index
        @a = "abcd"
        if @a != nil
        Kernel.system("ls")
        redirect_to root_path
        else
        end
    end
   end

def index
            @a = "abcd"
            if @a != nil
            Kernel.system("ls")
            else
            end
        end

root 'welcome#index'