如何正确调用函数并使用 bash [重复] 通过它们传递参数

Question

我正在尝试构建一个基本的计算器，但使用的是函数。我一遍又一遍地收到错误line 17: multiplication: command not found。所以我想我把函数调用错了？那么调用函数和传递参数的正确方法是什么？

#!/bin/bash

echo "Enter the operation:"
read operation

echo "Operand 1:"
read operand_1

echo "Operand 2:"
read operand_2

if [[ "$operation" == "+" ]]
  then 
    addition 
elif [[ "$operation" == "-" ]]
  then 
    subtraction 
elif [[ "$operation" == "*" ]]
  then 
    multiplication 
elif [[ "$operation" == "/" ]]
  then
    division 
fi

addition()
{
  result = $((operand_1+operand_2))
  result $result
}

subtraction()
{
  result = $((operand_1-operand_2))
  result $result

}
multiplication()
{
  result = $((operand_1*operand_2))
  result $result
}

division()
{
  result = $((operand_1/operand_2))
  result $result
}

result()
{
  echo "The result is $1"
}

Answer 1

您需要在 bash 脚本中调用它们之前定义函数