Unix for循環，提示輸入值。將值讀入ArrayVar [i]

Question

我正在嘗試在while循環中執行嵌套的if語句。我得到一個意外的「文件結尾」 。

while : 
do 
    if [ "$CHOICE" != "x" -o "$CHOICE != "X" ] 
    then 
    echo "Enter two whole numbers seperated by a space ex:1 123" 
    read Num1 Num2 
    if echo "$Num1$Num2" | egrep '^[0-9]+$' 2>/dev/null 
    then 
     # Num1 and Num 2 are INTS 
     break 
    else 
     break 
    fi 
    else 
    # One of the numbers is not an INT 
    printf 'Error: You did not enter two whole numbers, Try Again.\n\n' 
    continue 
    fi 
done 
echo "$Num1 $Num2" 

Answer 1

 
if [ "$CHOICE" != "x" -o "$CHOICE != "X" ] 
           ^
           /
     missing closing quote ---