I threw this together for the less savvy

  #!/bin/bash
  clear
  youtube-dl -U
  echo " "
  echo "YouTube Downloader Script"
  echo "A video file will be created in the folder where this script is located"
  echo " "
  echo "Please paste a URL and hit [ENTER]:"
  read URL
  youtube-dl $URL

Edit: youtube-dl -U only works if it was manually installed, so leave that out if you installed from apt or whatever