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/usr/sbin/ntpdate ntp.91.com; /sbin/hwclock --systohc

echo "#time update add by netdragon" >> /etc/crontab

echo "0 * * * * root (/usr/sbin/ntpdate ntp.91.com; /sbin/hwclock --systohc)"  >> /etc/crontab

echo "01 3 * * * root /usr/bin/yum -y update >/dev/null 2>&1" >> /etc/crontab