And time-related commands
Time-related commands date
01. Check time information:
[root@oldboyedu ~]# date
Tue Apr 16 11:49:51 CST 2019
02. adjust the time display format
[root@oldboyedu ~]# date +%F
2019-04-16
[root@oldboyedu ~]# date "+%F %T"
2019-04-16 11:52:54
[root@oldboyedu ~]# date "+%y-%m-%d %H:%M:%S"
19-04-16 11:53:58
cp oldboy.log oldboy.log-$(date "+%F_%T")
Display historical time information:
# date +%F -d "-2day"
# date +%F -d "1 day ago"
Future display time information:
# date -d "+2day"
# date -d "2day"
系统自动的备份数据 00:00 4月16日 -- 4月17日 00:00
cp /oldboy/oldboy.log /log/oldboy.log.$(date +%F)
调整:
cp /oldboy/oldboy.log /log/oldboy.log.$(date +%F -d "-1day")
03. How do the actual changes to the system
[root@oldboyedu oldboy]# date -s "2020-04-17"
Fri Apr 17 00:00:00 CST 2020
[root@oldboyedu oldboy]# date
Fri Apr 17 00:00:17 CST 2020
[root@oldboyedu oldboy]# date -s "2020/04/17 14:00"
Fri Apr 17 14:00:00 CST 2020
04. Time Synchronization Method
yum install -y ntpdate
ntpdate
[root@oldboyedu oldboy]# ntpdate ntp1.aliyun.com
16 Apr 12:22:33 ntpdate[25718]: step time server 120.25.115.20 offset 268748517.381960 sec
[root@oldboyedu oldboy]# date
Tue Apr 16 12:22:48 CST 2019