date                                                查看当前时间 date -s 15:14:13                                    修改时间  cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime 修改时区 yes   crontab -e                                          编写计划任务 */3 * * * * ntpdate 0.rhel.pool.ntp.org && hwclock -wESC后wq yum -y install ntpdate*                             安装ntpdate服务

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