Execute bash script

welcome.html.erb

<h1><%= @download %></h1>

<%= link_to "download", download_path(:ydit => "SB8-YY2DyHI") %>

<ul>
<% @mp3s.each do |m| %>
	<li><%= m  %></li>
<% end %>
</ul>

welcome_controller.rb

class WelcomeController < ApplicationController
  def index
  
  	dir="app/assets/mp3/"
	  @mp3s = Dir.entries(dir).reject{|entry| entry == "." || entry == ".."}
	  if @downloads 
	  	puts @download
	  end
	  v = params[:ytid]
	  @download = !%x[scripts/ytdown.sh v]

  end

end

ytdown.sh

!#/bin/bash
youtube-dl -x --audio-format mp3 --embed-thumbnail -o '/var/www/html/ytdown/app/assets/mp3/%(title)s.%(ext)s' https://www.youtube.com/watch?v=$1