# 產生新檔案
File.new("new_file.rb", "w")
# 撰寫檔案內容
File.open("new_file.rb", "w") { |file|
file.write("puts 'hello world'")
}
# 變數列表：
# w 覆寫整個檔案
# a 將內容加到檔案後方
# r 將內容加在檔案最前面
# 移除檔案
require 'fileutils'
FileUtils.remove("new_file.rb")
# 清楚標註路徑，避免在不同地方執行會抓不到檔案
File.expand_path("../new_file.rb", __FILE__)
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