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ファイルの先頭に文書をインサートする

Ruby

Posted at 2012-05-28

output.rb

open("./output.txt", "r+") do |file|
  # insert current time to head line
  lines = file.readlines
  lines.unshift("hello\n")
  file.rewind

  lines.each do |line|
    file.write line
  end
end

なんかもっといい手がありそう。

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