crontab

Unix/Linux 网络时间协议版本3 Network Time Protocol Version 3 (NTP) distribution for Unix systems

#
# NTP statistics periodic cleanup - REFERENCE SERVER ONLY
#
#55      23      *       *       * sh /local/NTP/etc/mvstats
#
# gather NTP client statistics - REFERENCE SERVER ONLY
#
0	8,18	*	*	*	/local/NTP/etc/cron 2>/dev/null | /usr/ucb/mail -s "NTP statistics" [e-mail]