You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: ridk_use.rb
    path of file: ./repos/rubyinstaller2/resources/files/ridk_use
    
    the code of the file until where you have to start completion: require "yaml"

def ridkuse_dirname
  File.expand_path("..", __FILE__)
end

def rubies_filename
  E
    
def print_help
  $stderr.puts <<-EOT
Usage:
    ridk use [<option>] [--default] [--system-default]

Option:
                  Start interactive version selection
    list          Search and list installed ruby versions
    update        Save or update the found ruby versions to rubies.yml
    <number>      Change the active ruby version by index
    /<regex>/     Change the active ruby version by regex
    help          Display this help and exit

    --default         Store the active ruby version in the user or
    --system-default  system environment variables permanently
EOT
end