文件中的Bash嵌套循环readline

Question

我被这个问题困住了。基本上我有两个不同的文本文件，其中一个带有问题，另一个带有答案。 Loop从文件中读取第一个问题并等待用户输入，然后将输入与其他文本文件中的第一行进行比较。但它通过整个第二个文件并比较所有行。

有一个代码。

#!/bin/bash 

wrong=0 
right=0 

while IFS='' read -r question || [[ -n "$question" ]]; 
do 
echo "$question" 
read input </dev/tty 
while IFS='' read -r answer || [[ -n "$answer" ]]; 
do 
    if [[ $answer == *"$input"* ]] 
    then 
    ((right+=1)) 
    else 
    ((wrong+=1)) 
fi 
done < answers.txt 
done < file.txt 

echo "Wrong answers: $wrong" 
echo "Right answers: $right" 

它在看什么，并采取从问题第一线，相比之下，在回答每一行，去了另一个问题。但我需要嵌套循环只与第一行比较，并移动到另一个问题等。

Answer 1

既然你期待从tty输入，我会假设文件不是非常大，记忆明智。因此，阅读他们完全入内存似乎是可行的，并且巧妙的方法避免处理问题您有：

#!/bin/bash 

wrong=0 
right=0 

# Use mapfile to read the files into arrays, one element per line 
mapfile -t questions < questions.txt 
mapfile -t answers < answers.txt 

# Loop over the indices of the questions array 
for i in "${!questions[@]}"; do 
    question="${questions[i]}" 
    [[ $question ]] || continue 

    # Look up the answer with the same index as the question 
    answer="${answers[i]}" 

    # Use read -p to output the question as a prompt 
    read -p "$question " input 
    if [[ $answer = *"$input"* ]] 
    then 
     ((right++)) 
    else 
     ((wrong++)) 
    fi 
done 

echo "Wrong answers: $wrong" 
echo "Right answers: $right" 

Answer 2

Antoshije, 

You would need to break the loop . try the below 

#!/bin/bash 

let wrong=0 
let right=0 


function check_ans 
{ 
in_ans=$1 
cat answers.txt | while read ans 
do 
    if [[ "$in_ans" == "$ans" ]] 
     then 
     echo "correct" 
     break; 
    fi 
done 
} 

cat questions.txt | while read question 
do 
    echo $question 
    read ans 
    c_or_w=$(check_ans "$ans") 
    if [[ $c_or_w == "correct" ]] 
    then 
     right=$((right+1)) 
    else 
     wrong=$((wrong+1)) 
    fi  
done 
echo "Wrong answers: $wrong" 
echo "Right answers: $right"