require 'filemagic'
fm = FileMagic.new
def crify(f)
  unless (d = IO.read(f))[-1] == "\n"
    puts "in #{f}"
    IO.write(f,d+"\n")
  end
end

Dir.glob("*/*.json"){|f|
  crify(f)
}
Dir.glob("*/*"){|f|
  case fm.file(f)
  when "Bourne-Again shell script, ASCII text executable"
      crify(f)
  end
}