https://www.chrisjmendez.com/2008/06/04/ruby-open-a-text-file-and-re-write-its-contents-into-a-new-text-file/

https://www.chrisjmendez.com/2008/06/04/ruby-open-a-text-file-and-re-write-its-contents-into-a-new-text-file/

https://www.chrisjmendez.com/2008/06/04/ruby-open-a-text-file-and-re-write-its-contents-into-a-new-text-file/

counter = 1
old_file = File.open("./Car.txt", "r")
new_file = File.new("./NewCar.txt", "w")
while( line = old_file.gets )
  new_file.puts "#{counter}: #{line}"
  counter = counter + 1
end
new_file.close

Basic example of how to open a text file and print them (including line-numbers) into a new text file

Open a text file and re-write its contents into a new text file

ruby

Ruby