方法一

grep进程名

[root@iZ25p102vo3Z ~]# ps -eo pid,lstart,etime,cmd | grep nginx

16968 Fri Mar  4 16:04:27 2016 41-21:14:04 nginx: master process /usr/sbin/nginx

17826 Fri Mar  4 22:53:51 2016 41-14:24:40 nginx: worker process

18312 Fri Apr 15 13:18:31 2016       00:00 grep --color=auto nginx

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方法二

指定进程号

ps -p PID -o lstart,etime  

参考链接:

​3 Ways to check process running time in Linux - SSLHOW​