如果文件是空的，使用Windows批处理文件如何检测（和删除）？ [英] How do I Detect (and Delete) a File if it is Empty using a Windows Batch File?

问题描述

如何使用Windows批处理文件检测文件是否为空？我想删除错误日志，如果它们是空的。

我知道for循环解决方案，如 http://anderwald.info/scripting/windows-batch-delete-all-empty-files-in -a-specified-folder / ，但是我想知道如果你知道有问题的特定单个文件需要测试，如果有一个更优雅的解决方案，因为我不想删除其他零字节文件

解决方案

您引用的链接使用以下内容删除所有0个长度的文件

  for / Fdelims =％Iin（'dir / B'）do if not exist％I \if％〜zI EQU 0 del ％I
  

这更复杂，效率不高。简单地使用：

  for％F in（*）do if％〜zF equ 0 del％F 
  

如果特定文件为零长度，则要删除该文件。因此，只需用您的文件名替换 * 通配符。

  ％F in（yourFileName）如果％〜zF equ 0 del％F
  

你将在批处理文件中使用它，而不是需要将所有百分比加倍（ %% F ， %%〜zF ）

如果不想使用FOR循环，可以使用CALL参数 - 它使用与FOR变量相同的修饰符。但是，CALL比FOR慢（在您的情况下可能不重要）

  @echo off 
 call：deleteIfEmpty yourFileName
 exit / b 
 
：deleteIfEmpty 
如果％〜z1 eq 0 del％1 
 exit / b 
  
 
 
 
编辑
 
 
 
我想到了另一种方式。 ^的FINDSTR搜索字符串将匹配文件的所有行。但是一个空文件没有任何行。因此，如果FINDSTR无法匹配某行，只需删除该文件。
 > nul findstr^YourFileName|| delyourFileName
  
 
How do I detect if a file is empty using a Windows batch file? I want to delete error logs if they are empty.

I am aware for for loop solutions such as http://anderwald.info/scripting/windows-batch-delete-all-empty-files-in-a-specified-folder/ but I was wondering if there was a more elegant solution if you know the specific single file in question that needs to be tested, as I may not wish to delete other zero byte files in the folder.
解决方案
The link you cited used the following to delete all 0 length files
for /F "delims=" "%I" in ('dir /B') do if not exist "%I\" if %~zI EQU 0 del "%I"
That is more complicated and not as efficient as it could be. It is much simpler to simply use:
for %F in (*) do if %~zF equ 0 del "%F"
You want to delete a specific file if it is zero length. So just substitute your file name for the * wild card.
for %F in ("yourFileName") do if %~zF equ 0 del "%F"
If you are going to use this in a batch file than you need to double all the percents (%%F, %%~zF)

If you don't want to use a FOR loop, you can use a CALL parameter instead - it uses the same modifiers as FOR variables. However, CALL is slower than FOR (probably not significant in your case)
@echo off
call :deleteIfEmpty "yourFileName"
exit /b

:deleteIfEmpty
if %~z1 eq 0 del %1
exit /b
EDIT

I've thought of yet another way. A FINDSTR search string of "^" will match all lines of a file. But an empty file doesn't have any lines. So simply delete the file if FINDSTR fails to match a line.
>nul findstr "^" "yourFileName" || del "yourFileName"


                        
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