# File lib/pry/command_set.rb, line 224
    def rename_command(new_name, old_name, options={})
      cmd = find_command_by_name_or_listing(old_name)

      options = {
        :listing     => new_name,
        :description => cmd.description
      }.merge!(options)

      commands[new_name] = cmd.dup
      commands[new_name].name = new_name
      commands[new_name].description = options.delete(:description)
      commands[new_name].options.merge!(options)
      commands.delete(cmd.name)
    end