语法错误：无效的算术运算符（错误标记是＆QUOT;＆QUOT;） [英] syntax error: invalid arithmetic operator (error token is "")

问题描述

我试图写一个函数检查一个文本文件，一行行，某些cretirias检查每个字段，然后总结这一切。我使用的是完全相同的方式来总结cretirias中的每一个，但是对于4一（在code这将是一次）我得到错误的称号。我试图消除，总结我的code工作就好了时间和路线，我不知道这有什么错行了，我pretty新猛砸。帮助每一位将AP preciated！

I am trying to write a function the checks a text file, line by line, checking each field by certain cretirias, and then sums it all up. I am using the exact same way to sum each one of cretirias, but for the 4th one (in the code it will be time) I get the error in the title. I tried removing the line that sums the time and my code worked just fine, I have no clue what's wrong with the line and I'm pretty new to Bash. Every bit of help will be appreciated!

这里的code：

#!/bin/bash
valid=1
sumPrice=0
sumCalories=0
veganCheck=0
sumTime=0
function checkValidrecipe
{
    while read -a line; do
        if (( ${line[1]} > 100 )); then
            let valid=0
        fi
        if (( ${line[2]} > 300 )); then
            let valid=0
        fi
        if (( ${line[3]} != 1 && ${line[3]} != 0 )); then
            let valid=0
        fi
        if (( ${line[3]} == 1)); then
            veganCheck=1
        fi
        let sumPrice+=${line[1]}
        let sumCalories+=${line[2]}
        let sumTime+=${line[4]}
    done < "$1"
}
checkValidrecipe "$1"
if (($valid == 0)); then
    echo Invalid
else
    echo Total: $sumPrice $sumCalories $veganCheck $sumTime
fi

和我认为每一个输入文件将在以下格式：

And I can assume that every input file will be in the following format:

name price calories vegancheck time

我试图运行与此输入文件中的脚本：

I am trying to run the script with this input file:

t1 50 30 0 10
t2 10 35 0 10
t3 75 60 1 60
t4 35 31 0 100
t5 100 30 0 100

（包括空行）

和这里的输出：

")syntax error: invalid arithmetic operator (error token is "
")syntax error: invalid arithmetic operator (error token is "
")syntax error: invalid arithmetic operator (error token is "
")syntax error: invalid arithmetic operator (error token is "
")syntax error: invalid arithmetic operator (error token is "
Total: 270 186 1 0

非常感谢你的帮助！

Thank you very much for your help!

推荐答案

您输入文件包含CR + LF行结束符。因此，变量 $ {行[4]} 不是像 10 若干但 10 \\ r 这将导致错误。

Your input file contains CR+LF line endings. As such, the variable ${line[4]} isn't a number like 10 but 10\r which causes the error.

删除使用工具输入文件中的回车符，如 DOS2UNIX的。

Remove carriage returns from the input file using a tool such as dos2unix.

另外，你可以改变你的脚本，通过修改来处理它。

Alternatively, you could change your script to handle it by modifying

done < "$1"

到

done < <(tr -d '\r' < "$1")

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