本文记录了在特定环境下使用date命令调整系统时间的过程，并展示了不同用户权限下设置时间的效果。
[oracle@Slave1Hadoop51 ~]$ date
Tue Feb 3 12:09:09 CST 2015
[oracle@Slave1Hadoop51 ~]$ date Fri Feb 6 23:47:53 CST 2015
date: extra operand `Feb'
Try `date --help' for more information.
[oracle@Slave1Hadoop51 ~]$ date -s "2015-02-06 23:51:00"
date: cannot set date: Operation not permitted
Fri Feb 6 23:53:21 CST 2015
[oracle@Slave1Hadoop51 ~]$
Tue Feb 3 12:09:09 CST 2015
[oracle@Slave1Hadoop51 ~]$ date Fri Feb 6 23:47:53 CST 2015
date: extra operand `Feb'
Try `date --help' for more information.
[oracle@Slave1Hadoop51 ~]$ date -s "2015-02-06 23:51:00"
date: cannot set date: Operation not permitted
Fri Feb 6 23:51:00 CST 2015
[root@Slave1Hadoop51 ~]# date -s "2015-02-06 23:52:00"
Fri Feb 6 23:52:00 CST 2015
[root@Slave1Hadoop51 ~]# date -s "2015-02-06 23:52:30"
Fri Feb 6 23:52:30 CST 2015
[root@Slave1Hadoop51 ~]# date
Fri Feb 6 23:52:41 CST 2015
[root@Slave1Hadoop51 ~]# clock -w
[root@Slave1Hadoop51 ~]#
Fri Feb 6 23:53:21 CST 2015
[oracle@Slave1Hadoop51 ~]$
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