批处理文件比较数字 [英] Batch files compare numbers

问题描述

我必须写一个脚本，检查驱动器中是否有足够的空间。
我写了以下内容：

  @echo off 
 set gbsize = 1,073,741,824 
 Set gbsize =％gbsize：，=％
 for / ftokens = 3%% a in（'dir c：\'）do（
 set / a bytesfree = %% a 
 ）
 set bytesfree =％bytesfree：，=％
 endlocal&& set bytesfree =％bytesfree％
 
如果％gbsize％gtr％bytesfree％echo hi 
  

但是当脚本抛出错误：
无效的数字。数字常数是十进制（17），
十六进制（0x11）或八进制（021）。

可以任何人帮助？
谢谢！

解决方案

您的直接问题是在您的值中有逗号时尝试使用SET / / p>

您还需要在定义gbsize时删除before和after =之后的空格。

为什么你有endlocal没有setlocal

我相信这是你正在寻找。如果有少于1GB的可用空间，它将回显hi。

  @echo off 
 setlocal 
 set gbsize = 1,073,741,824 
设置gbsize =％gbsize：，=％
为/ ftokens = 3%% a in（'dir c：\'）do set bytesfree = %% a 
 set bytesfree =％bytesfree：，=％
如果％gbsize％gtr％bytesfree％echo hi 
  

b $ b

另一种更直接（可能更准确的）获取自由空间的方式

  ftokens = 2%% S in（'wmic volume get DriveLetter ^，FreeSpace ^ | findC：'）do set bytesfree = %% S 
  

I have to write a script that check if there is enough space in the drive. I wrote the following:

@echo off
set gbsize = 1,073,741,824
Set gbsize=%gbsize:,=%
for /f "tokens=3" %%a in ('dir c:\') do (
    set /a bytesfree=%%a
)
set bytesfree=%bytesfree:,=%
endlocal && set bytesfree=%bytesfree%

If %gbsize% gtr %bytesfree% echo hi

but when the script thrown error: Invalid number. Numeric constants are either decimal (17), hexadecimal (0x11), or octal (021).

what did I miss? can anyone help? thanks!

解决方案

Your immediate problem is attempting to use SET /A when there are commas in your value.

You also need to remove the spaces before and after = when you define gbsize.

I don't understand why you have endlocal without a setlocal

I believe this is what you were looking for. It will echo "hi" if there is less then 1GB free space.

@echo off
setlocal
set gbsize=1,073,741,824
Set gbsize=%gbsize:,=%
for /f "tokens=3" %%a in ('dir c:\') do set bytesfree=%%a
set bytesfree=%bytesfree:,=%
If %gbsize% gtr %bytesfree% echo hi

Another, more direct, (and possibly more accurate?) way to get the free space

for /f "tokens=2" %%S in ('wmic volume get DriveLetter^, FreeSpace^|find "C:"') do set bytesfree=%%S

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