#!/bin/sh  
mem=`free -m | awk 'NR==2{print $2}'`  
ps -aux 2>&1 | sort -k 4 -r | awk '$4 ~ /^[0-9]/ && $4>0 {print $4,$11}' | awk '{print $1/100*mem"   "$2}' mem=$mem | sort -k 2 | awk '  
{  
   a[$2] += $1;  
   b[$2]++;  
   total += $1;  
   total++;  
}  
END{  
  for(i in a){  
    t=i;  
    gsub(/:|.*\//, "", t);  
    printf "%10s   %s\n" ,a[i]"MB", t"["b[i]"]";  
  }  
print "Memory Total: "mem"MB, used: "total"MB, free: "mem-total"MB."  
}' mem=$mem | sort -n -r 

[root@Test230 zy]# sh mem.sh   
 3024.17MB   java[17]  
 78.96MB   java[1]  
 3.948MB   python[1]  
 3.948MB   ntpd[1]  
 3.948MB   iscsid[1]  
 3.948MB   gdmgreeter[1]  
Memory Total: 3948MB, used: 3140.92MB, free: 807.08MB.