语法错误：文件意外结束（Bash 的新功能）

Question

我是 Bash/Scripting 的新手，我想使用 Bash 创建一个基本的计算器。 我创建此代码只是为了测试我是否可以选择暂时添加。 这是我的代码，如果有比我上面提到的更多的错误，请随时告诉我。

#! /bin/bash
#echo "Testing Calculator. Enter a number:"
#read NUM1
#echo "Your number is: $NUM1"

MENU_OPTIONS(){
echo "***** Menu Options *****"
echo "1 = ADD"
echo "2 = SUBTRACT"
echo "3 = MULTIPLY"
echo "4 = DIVIDE"
echo "Q = EXIT"
echo "************************"
}

ADDITION(){
echo "Please enter first number:"
read NUM_1
echo "Please enter second number:"
read NUM_2
NUM_3 = NUM_1 + NUM_2
echo "$NUM_1 + $NUM_2 equals $NUM_3"
}

USER_INPUT='a'
while [ $USER_INPUT != "Q" ]; do
    
    MENU_OPTIONS
    read USER_INPUT
    
    if [ $USER_INPUT = "1" ]
    then 
        ADDITION
    else
        echo "Bye."
        
    fi

Answer 1

您最后缺少“完成”关键字以关闭 while 循环

while [ $USER_INPUT != "Q" ]; do   
    MENU_OPTIONS
    read USER_INPUT
    
    if [ $USER_INPUT = "1" ]
    then 
        ADDITION
    else
        echo "Bye."
    
    fi
done

#You also need to calc NUM_3 in this way:

ADDITION(){
    echo "Please enter first number:"
    read NUM_1
    echo "Please enter second number:"
    read NUM_2
    NUM_3=$(( NUM_1 + NUM_2 ))
    echo "$NUM_1 + $NUM_2 equals $NUM_3"
}