没有找到指令

Question

我是shell脚本新手

以下是我的剧本

#!/bin/bash

first_num = 0
second_num = 0

echo -n "Enter the first number =>"
read first_num
echo -n "Enter the second number =>"
read second_num

echo "first + second = $((first_num + second_num))"

每当我运行它时，它会打印如下

/Users/haani/arithmetic.bash: line 3: first_num: command not found 

/Users/haani/arithmetic.bash: line 4: second_num: command not found  

Enter the first number =>

在这里找不到命令的原因是什么？

Answer 1

尝试没有空格：

first_num=1