shell scripting-bash中的算術計算

Question

我有一個輸入記事本文件，如下所示：

樣本輸入文件：

蔬菜和費率

kg  rate    total 
Tomato  4   50  100
potato  2   60  120 
Beans   3   80  240

總數：（100 + 120 ++ 240）= 460

我需要將第2列和第3列相乘，並檢查總數是否正確以及總數。 如果不正確，我們需要在同一文件中打印一條錯誤消息，如下所示

在這里輸入代碼

樣本輸出文件：

蔬菜和費率

kg  rate    vegtotal

Tomato  4   50  200
potato  2   60  120 
Beans   3   80  240

總數：（200 + 120 ++ 240）= 560

計算錯誤：西紅柿的蔬菜錯誤：應該是200而不是100總體錯誤：應該是560而不是460

到目前為止的代碼：

for f in Date*.log; do
       awk 'NR>1{ a[$1]=$2*$3 }{ print }END{ printf("\n");
            for(i in a)
       { if(a[i]!=$4)
              { print i,"Error in calculations",a[i] }
            } }' "$f" > tmpfile && mv tmpfile "$f"; 

done

它計算總計，但不比較值。 如何比較它們並打印到同一文件？

Answer 1

復雜的awk解決方案：

awk 'NF && NR>1 && $0!~/total:/{ 
         r=$2*$3; v=(v!="")? v"+"r : r; 
         if(r!=$4){ veg_er[$1]=r" instead of "$4 } 
         err_t+=$4; t+=r; $4=r 
     }
     $0~/total/ && err_t { 
         print $1,"("v")",$3,t; print "Error in calculations:"; 
         for(i in veg_er) { print "Veg total for "i" is wrong: it should be "veg_er[i] } 
         print "Overalltotal is wrong: It should be "t" instead of "err_t; next 
     }1' inputfile

輸出：

kg  rate    total 
Tomato 4 50 200
potato 2 60 120
Beans 3 80 240

Overalltotal: (200+120+240) = 560
Error in calculations:
Veg total for Tomato is wrong: it should be 200 instead of 100
Overalltotal is wrong: It should be 560 instead of 460

---

細節：

• NF && NR>1 && $0!~/total:/ -考慮蔬菜行（不包括標題和總行 ）

• r=$2*$3第二和第三字段的乘積結果

• v=(v!="")? v"+"r : r v=(v!="")? v"+"r : r連接結果乘積值

• veg_er包含錯誤蔬菜信息（ 蔬菜名稱，錯誤產品值和實際產品值）的數組

• err_t+=$4累積錯誤的總價值

• t+=r累計實際總價值

• $0~/total/ && err_t處理總行和錯誤事件

Answer 2

輸入項

akshay@db-3325:/tmp$ cat file
kg  rate    total
Tomato 4 50 100 
potato 2 60 120 
Beans 3 80 240

輸出量

akshay@db-3325:/tmp$ awk 'FNR>1{sum+= $2 * $3 }1;END{print "Total : "sum}' file
kg  rate    total
Tomato 4 50 100 
potato 2 60 120 
Beans 3 80 240
Total : 560

說明

awk '                              # call awk
    FNR>1{                         # if no of lines of current file is greater than 1, 
                                   # then , this is to skip first row
            sum+= $2 * $3          # sum total which is product of value
                                   # in column2 and column3
     }1;                           # 1 at the end does default operation, 
                                   # that is print current record ( print $0 )
                                   # if you want to skip record being printed remove "1", so that script just prints total
     END{                          # end block
            print "Total : "sum    # print sum
     }
    ' file