Shell脚本，用于将行相乘并将总和相加

但我不知道为什么最后的4096会出现在我的输出中

然后我还需要删除（字节）并只打印值，所以我使用了下面的语法

 Thanks all for the inputs but now i landed up in another problem .

  This is my Orginal syntax 

   db2 list tablespaces show detail | grep -e " Free pages" -e " Page size"
   Free pages                           = Not applicable
 Page size (bytes)                    = 4096
 Free pages                           = Not applicable
    Page size (bytes)                    = 4096
  Free pages                           = Not applicable
  Page size (bytes)                    = 4096
   Free pages                           = 36960
    Page size (bytes)                    = 32768
  Free pages                           = 40800
 Page size (bytes)                    = 16384
  Free pages                           = 22656
   Page size (bytes)                    = 4096
  Free pages                           = Not applicable
      Page size (bytes)                    = 4096

      Now if i see Not applicable then i should remove Not applicable line and as well as the proceeding line for that i used the below syntax 

  db2 list tablespaces show detail | grep -e " Free pages" -e " Page size"  | awk '/Not/{getline;next} 1'

  Free pages                           = 36960
 Page size (bytes)                    = 32768
 Free pages                           = 40800
  Page size (bytes)                    = 16384
 Free pages                           = 22656
 Page size (bytes)                    = 4096

36960 32768 40800 16384 22656 4096

我忘了提到关于我的第一篇帖子（我的问题是我想将第1行乘以第2行，然后将第3行乘以第4行，将第5行乘以第6行，直到输出结束，最后将整个总和相加）

如下

36960*32 40800 * 16 然后继续 由此我需要GB中的值除以1024，再除以1024，因为原始值是KB

in the second line , fourth line and sixth line i need to take only the first 2 charchater and then multiply

---

对于bash

shell脚本

：

                 I know i am asking too much but can some one help ??
                     Waiting for some reply .. Thanks

然后运行：

#!/bin/bash
TOTAL=0
while read A && read B; do
    (( TOTAL += A * B ))"
done
echo "Total: $(( TOTAL / 1024 / 1024 )) GB"

bash script.sh

如果您希望它能够跨多种类型的shell使用，那么这个概念应该很容易转换。请考虑命令<代码> BC/<代码>和其他类似的工具。

#!/bin/bash
TOTAL=0
while read A && read B; do
    (( TOTAL += A * B ))"
done
echo "Total: $(( TOTAL / 1024 / 1024 )) GB"

bash script.sh < input_file