challenge #4, listing files recursively with Ruby

After almost a couple of months i have been now able to write a program to lists the files in a directory recursively. I was disappointed at first that i could write a program to do that but now i can. I have also picked up a few useful things on the way to solving the challenge that i would not have understood if i left the challenge or problem. The program is just about ten lines of code in ruby.
1  def list(file_name)
2    Dir.new(”#{file_name}”).each do |file|
3       next if file.match(/^\.+/)
4       path = “#{file_name}/#{file}”
5       if  FileTest.directory?(”#{path}”)
6         list(”#{path}”)
7       else
8          puts path
9        end
10     end
11  end

12  list(”/home/foo”)

On line #3, if the directory contains the .. and . directorys move to the next item in loop