在使用某些事物的循环不确定时显示

Question

我有这个 while 循环，在它下面我试图得到下面列出的结果。循环的目的是遍历 BookDB.txt 并找到与标题或作者匹配的所有模式，找到后循环将打印出来，但目前我的问题是我试图在之前插入一行所有匹配模式的列表称为 "Number of Records Found: X"。

number of records found: X
Title,Author,Price,QtyAvailable,QtySold

我不确定将获取记录的行放在哪里，因为如果我将它放在循环中，它将变得重复，我试图避免重复找到的记录数行

#matching item 1     
number of records found: X
Title,Author,Price,QtyAvailable,QtySold

#matching item 2
number of records found: X
Title,Author,Price,QtyAvailable,QtySold

但我不确定我应该如何修改我的代码来做到这一点。需要帮助，文件的输入是

 Title:Author:Price:QtyAvailable:QtySold


function search_book
 {
echo "Enter Title: "
read title_r
echo "Enter Author: "
read author_r
while read -r result
do
title=$(echo "$result" | cut -f 1 -d ":")
author=$(echo "$result" | cut -f 2 -d ":")
price=$(echo "$result" | cut -f 3 -d ":")
qty_ava=$(echo "$result" | cut -f 4 -d":")
qty_sold=$(echo "$result" | cut -f 5 -d ":")
if echo "$title" | grep -iq "$title_r" && echo "$author" | grep -iq "$author_r";
then
record=$(grep -io "$title" BookDB.txt | sort | uniq -c)
echo -e "$title,$author,$price,$qty_ava,$qty_sold"      
fi  
done < ./BookDB.txt
echo ""
echo "Number of records found: " $record | cut -f1-6 -d" "
echo ""

  }

Answer 1

你只需要将记录行放在 while 循环之前并首先回显记录然后循环将运行通过程序，并显示你的匹配模式列表而没有任何重复的记录

function search_book
{
   echo "Enter Title: "
   read title_r
   echo "Enter Author: "
   read author_r
   record=$(grep -io "$title_r" BookDB.txt | sort | uniq -c)
   echo "Number of records found: " $record | cut -f1-6 -d" "
   while read -r result
   do
   title=$(echo "$result" | cut -f 1 -d ":")
   author=$(echo "$result" | cut -f 2 -d ":")
   price=$(echo "$result" | cut -f 3 -d ":")
   qty_ava=$(echo "$result" | cut -f 4 -d":")
   qty_sold=$(echo "$result" | cut -f 5 -d ":")
   if echo "$title" | grep -iq "$title_r" && echo "$author" | grep -iq "$author_r";
   then
   #record=$(grep -io "$title" BookDB.txt | sort | uniq -c)
   echo -e "$title,$author,"$"$price,$qty_ava,$qty_sold"
   fi   
   done < ./BookDB.txt
   echo ""
   #echo "Number of records found: " $record | cut -f1-6 -d" "
   echo ""
   main_menu

}

在使用某些事物的循环不确定时显示

Display while using loop uncertain of certain things

shell

while-loop