比較數組值和用戶輸入的bash

Question

我正在嘗試將用戶輸入與字符串數組值進行比較，當我這樣做時，當我將它們打印出來時，兩個值似乎是相同的，但是if語句認為它們不相等。 有什么明顯的我想念的東西嗎？

k=0
while [ -z $arg1 ]
do
    while [ $k -ne 9 ]
    do
    # ask question
    echo "${question[k]}"
    answer="${answer[k]}"
    read -p "YES/NO " arg1
    # check answer
    if [ '$arg1' = '$answer' ]; # problem is here
    then
        echo "Correct!"
        let "k=$k+1"
    else
        echo "Incorrect!"
        echo "Your answer: $arg1"
        echo "Correct answer: $answer"
    fi
    done
done

Answer 1

替換：您尚未將答案和問題數組中的內容放入

 if [ '$arg1' = '$answer' ];
 with
 if [ "$arg1" = "$answer" ] ; 

並檢查