办法一
grep 过程名
[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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办法二
指定过程号
ps -p PID -o lstart,etime
参考链接：
3 Ways to check process running time in Linux