splitして各々にヘッダ付ける

gistfile1.rb

class StringEditor

  def concat_header(file)
    open(file, 'r+') do |f|
      f.puts "header\n#{open(file).read}"
    end
  end

  def split
    system "split -a 1 -l 1 hoge.txt hogehoge_"
  end

  def concat_each
    Dir.glob('hogehoge_*') do |file|
      concat_header(file)
    end
  end

  def run
    split
    concat_each
  end
end