[root@vps-10811 extra]# s=0;n=0;for pid in ` ps -ef | grep httpd  | grep -v "gre
p"| awk '{print $2}'`;do                                                        
>  a=`pmap -d $pid | grep private | awk '{print $4}'`;                          
>  l=`expr length $a - 1`;                                                      
>  b=`expr substr $a 1 $l`                                                      
>  s=`expr $s + $b`                                                             
>  n=`expr $n + 1 `                                                             
> done                                                                          
[root@vps-10811 extra]# echo "s=$s"                                             
s=157832                                                                        
[root@vps-10811 extra]# echo "num=$n"                                           
num=101