gistfile1.txt

keywords = File.open('keywords.txt', 'r+')
prnums = File.open('prods.txt', 'r+')

prnums.lines.each do |line|
  cells = line.split(",")
  prnum = cells.first
  description = cells.last

  keywords.lines.each do |keyword|
    if description.include? keyword
      puts prnum
    end
  end
end