windows 如何在批处理中检查文件是否为空
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How to check if a file is not empty in Batch
提问by laggingreflex
There are several ways google throws at me for checking if a file is empty but I need to do the opposite.
谷歌向我抛出了几种方法来检查文件是否为空，但我需要做相反的事情。
If (file is NOT empty)
do things
How would I do this in batch?
我将如何批量执行此操作？
回答by Bali C
for /f %%i in ("file.txt") do set size=%%~zi
if %size% gtr 0 echo Not empty
回答by risingDarkness
this should work:
这应该有效：
for %%R in (test.dat) do if not %%~zR lss 1 echo not empty
help ifsays that you can add the NOTdirectly after the ifto invert the compare statement
help if说你可以在NOT后面直接添加if来反转比较语句
回答by David Brabant
set "filter=*.txt"
for %%A in (%filter%) do if %%~zA==0 echo."%%A" is empty
Type help forin a command line to have explanations about the ~zA part
键入help for的命令行有关于〜ZA部分解释
回答by Hashbrown
You can leverage subroutines/external batch files to get to useful parameter modifierswhich solve this exact problem
您可以利用子例程/外部批处理文件来获得有用的参数修饰符来解决这个确切的问题
@Echo OFF
(Call :notEmpty file.txt && (
Echo the file is not empty
)) || (
Echo the file is empty
)
::exit script, you can `goto :eof` if you prefer that
Exit /B
::subroutine
:notEmpty
If %~z1 EQU 0 (Exit /B 1) Else (Exit /B 0)
Alternatively
或者
notEmpty.bat
notEmpty.bat
@Echo OFF
If %~z1 EQU 0 (Exit /B 1) Else (Exit /B 0)
yourScript.bat
yourScript.bat
Call notEmpty.bat file.txt
If %errorlevel% EQU 0 (
Echo the file is not empty
) Else (
Echo the file is empty
)
