Ruby - How to write a new file with output from script

Question

I have a simple script that does some search and replace. This is basically it:

File.open("us_cities.yml", "r+") do |file|   while line = file.gets   "do find a replace"   end   "Here I want to write to a new file" end 

As you can see I want to write a new file with the output. How can I do this?

Answer 1

Outputting to a new file can be done like this (don't forget the second parameter):

output = File.open( "outputfile.yml","w" ) output << "This is going to the output file" output.close 

So in your example, you could do this :

File.open("us_cities.yml", "r+") do |file|   while line = file.gets     "do find a replace"   end   output = File.open( "outputfile.yml", "w" )   output << "Here I am writing to a new file"   output.close       end 

If you want to append to the file, make sure you put the opening of the output file outside of the loop.

Answer 2

First you have to create a new file such as newfile.txt

Then change the script to

File.open("us_cities.yml", "r+") do |file|   new_file = File.new("newfile.txt", "r+")   while line = file.gets   new_file.puts "do find a replace"   end end 

This will make a new file with the output