M-x auto-fill-mode C+u 80 C+x f init.el ;; text-mode時は自動的に auto-fill-mode をonにする (add-hook 'text-mode-hook 'turn-on-auto-fill)

install/setup $ sudo apt-get install ntpdate $ sudo /usr/sbin/ntpdate time.asia.apple.com 6 Oct 16:29:14 ntpdate[5350]: adjust time server 17.83.253.7 offset 0.006553 sec