bash 语法错误：无效的算术运算符（错误标记为“”）
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syntax error: invalid arithmetic operator (error token is "")
提问by user2364312
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!
我正在尝试编写一个函数，逐行检查文本文件，按特定条件检查每个字段，然后将其汇总。我使用完全相同的方式对每个 cretirias 求和，但是对于第 4 个（在代码中是时间），我在标题中收到错误。我尝试删除总结时间的行，我的代码运行良好，我不知道该行有什么问题，而且我对 Bash 还很陌生。每一点帮助将不胜感激！
Here's the code:
这是代码：
#!/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 < ""
}
checkValidrecipe ""
if (($valid == 0)); then
echo Invalid
else
echo Total: $sumPrice $sumCalories $veganCheck $sumTime
fi
And I can assume that every input file will be in the following format:
我可以假设每个输入文件都采用以下格式：
name price calories vegancheck time
I am trying to run the script with this input file:
我正在尝试使用此输入文件运行脚本：
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
(Blank line included)
（包括空行）
And here's the output:
这是输出：
")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
Thank you very much for your help!
非常感谢您的帮助！
回答by devnull
Your input file contains CR+LF line endings. As such, the variable ${line[4]}isn't a number like 10but 10\rwhich causes the error.
您的输入文件包含 CR+LF 行尾。因此，变量${line[4]}不是数字，10但10\r会导致错误。
Remove carriage returns from the input file using a tool such as dos2unix.
使用诸如dos2unix.
Alternatively, you could change your script to handle it by modifying
或者，您可以更改脚本以通过修改来处理它
done < ""
to
到
done < <(tr -d '\r' < "")
