# File lib/chef/knife/client_reregister.rb, line 37
      def run
        @client_name = @name_args[0]

        if @client_name.nil?
          show_usage
          ui.fatal("You must specify a client name")
          exit 1
        end

        client = Chef::ApiClient.reregister(@client_name)
        Chef::Log.debug("Updated client data: #{client.inspect}")
        key = client.private_key
        if config[:file]
          File.open(config[:file], "w") do |f|
            f.print(key)
          end
        else
          ui.msg key
        end
      end