带变量的bash算术表达式 [英] bash arithmetic expressions with variables

问题描述

我在bash文件(unix文件.sh)中的算术表达式上遇到麻烦.

I am having troubles with the arithmetic expressions in a bash file (a unix file .sh).

我有一个变量"total"，它由一些用空格隔开的数字组成，我想计算它们的总和(在变量"dollar"中).

I have the variable "total", which consists of a few numbers separated by spaces, and I want to calculate the sum of them (in the variable "dollar").

#!/bin/bash
..
dollar=0
for a in $total; do
  $dollar+=$a
done

我知道我在算术括号中缺少某些内容，但无法使它与变量一起使用.

I know I am missing something with the arithmetic brackets, but I couldn't get it to work with variables.

推荐答案

在((...))中包装算术运算:

dollar=0
for a in $total; do
  ((dollar += a))
done

这篇关于带变量的bash算术表达式的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！