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

问题描述

我如何检测一个文件中使用DOS批处理文件是空的？我想删除错误日志，如果他们是空的。

How do I detect if a file is empty using a DOS batch file? I want to delete error logs if they are empty.

我知道为循环解决方案，如<一个href=\"http://anderwald.info/scripting/windows-batch-delete-all-empty-files-in-a-specified-folder/\">http://anderwald.info/scripting/windows-batch-delete-all-empty-files-in-a-specified-folder/但我想知道是否有一个更好的解决方案，如果你知道有关具体的单个文件，需要进行测试，因为我可能不希望在文件夹中删除其它的零字节文件。

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.

推荐答案

在引使用的链接下面的删除所有0长度的文件

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"

这是更复杂，效率不高，因为它可以。这是更简单简单地使用：

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"

您想删除特定文件，如果它的长度为零。所以，刚刚替补文件名称为 * 通配符。

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"

如果您打算比您需要的所有的百分数（ %%˚F， %%〜ZF翻倍使用这个批处理文件）

If you are going to use this in a batch file than you need to double all the percents (%%F, %%~zF)

如果你不想使用FOR循环，你可以使用一个调用参数，而不是 - 它使用相同的修饰符变量。然而，CALL是比（可能你的情况并不显著）

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

修改

我想过的另一种方式。 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。所以，简单地删除该文件，如果FINDSTR不匹配行。

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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