考大家一个很简单的veket问题——但你们未必懂的

小鱼儿

龙卧家

no 不知道啊 求解！

进士小站

回帖看看啦

言午YUAN

不懂就只能回帖了……

dhpdssg

1.      who -b 查看最后一次系统启动的时间。
   
2.       who -r 查看当前系统运行时间
   
3. last reboot
   
4. uptime
   
5. 
   

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1. cat /proc/uptime
   
2. date -d "`cut -f1 -d. /proc/uptime` seconds ago"
   
3. date -d "$(awk -F. '{print $1}' /proc/uptime) second ago" +"%Y-%m-%d %H:%M:%S"  

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1. Following are the rest of the time function in the above perl code-snippet.
   
2. 
   
3. ■$total=((($1*24+$2)*60+$3)*60) – Calculate the total amount of seconds the system is UP. i.e (((days*24+hours)*60+minutes)*60 which gives the seconds (like an epoch calculation)
   
4. ■$now=time(); – Get the current time in seconds ( epoch time )
   
5. ■$now-=$total; – Subtract total system running time from current time. So this is getting the exact time in second when the system was started
   
6. ■$now=localtime($now); – Convert the epoch time ( time in seconds ). localtime returns given epoch time in human readable format
   
7. ■print $now,”\n” – Finally, this prints the time.

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http://www.cnblogs.com/kerrycode/p/3759395.html
http://www.averainy.info/linux-system-operation-time-and-the-view-of-the-latest-powered-up-time/
http://www.thegeekstuff.com/2011/10/linux-reboot-date-and-time