More than 5 years have passed since last update.

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。

You get articles that match your needs
You can efficiently read back useful information
You can use dark theme

What you can do with signing up