笔记：获取进程实际运行时间

[root@localhost ~]# netstat -antp
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 192.168.50.248:6666     0.0.0.0:*               LISTEN      2296/scheduling     
tcp        0      0 0.0.0.0:6667            0.0.0.0:*               LISTEN      2533/parsepacket    
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      817/sshd            
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      2084/master         
tcp        0     52 192.168.50.248:22       192.168.50.4:9518       ESTABLISHED 18467/sshd: root@pt 
tcp        0      0 192.168.50.248:22       192.168.50.4:9833       ESTABLISHED 31086/sshd: root@pt 
tcp6       0      0 :::3306                 :::*                    LISTEN      2255/mysqld         
tcp6       0      0 :::22                   :::*                    LISTEN      817/sshd            
[root@localhost ~]# ps -p 2533 -o etime,cmd,pid
    ELAPSED CMD                           PID
 1-04:31:32 parsepacket start            2533

通过ps命令的etime（elapsed time的缩写）可以获取该值