shell 求和问题

[veryeasy97]

一文件（每10分钟动态更新一次）倒数第二行格式如下：
TEST001,Time0048,3.0,0.0,10.8,42.4,51.8,0.0,0.0,10.8,0.0,0.0,0.0,0.0,29.3,0.0,10.2,12.4,0.0,0.0
现在需要对该行的第三列起（含第三列，“，”为分列符号）的后十八列求和，请高手指教，谢谢！

[qq120848369]

#!/bin/bash

tail -n 2 $1 | head -n 1 | awk '
       BEGIN{
          FS=",";
          sum=0;
       }
       
       {
          for(i=2;i<=NF;++i)
          {
             sum+=$i;
           }
       }
       END{
       print sum;
       }
'

[veryeasy97]

成功得到结果，谢谢！

[chinasingle]

已经搞定了 学习下