批量删除字符串中的字符 [英] Batch To Remove Character From A String

问题描述

这似乎很基本，但是有没有办法创建一个批处理，以从txt文件的字符串中删除char. ?

this may seem basic but Is there a way to create a batch to remove char from a string from a txt file. ?

如果我已经在.txt文件中包含此文件

If I already have this inside the .txt file

2005060.png  
2005070.png  
2005080.png  
2005090.png

因此，有一种方法可以创建一个批处理文件，该文件将在最后删除.png以便仅在新的.txt文件中显示该文件.

so is there a way to create a batch file that will remove the .png at the end to show only this in a new .txt file

2005060  
2005070  
2005080  
2005090

谢谢您的帮助！ :)

推荐答案

您可以按照以下命令脚本进行操作:

You can do it as per the following command script:

@setlocal enableextensions enabledelayedexpansion
@echo off
set variable=2005060.png
echo !variable!
if "x!variable:~-4!"=="x.png" (
    set variable=!variable:~0,-4!
)
echo !variable!
endlocal

这将输出:

2005060.png
2005060

神奇的路线当然是:

set variable=!variable:~0,-4!

这将删除最后四个字符.

which removes the last four characters.

如果您的文件testprog.in带有一行，例如:

If you have a file testprog.in with lines it it, like:

2005060.png
1 2 3 4 5      leave this line alone.
2005070.png
2005080.png
2005090.png

您可以稍作修改:

@setlocal enableextensions enabledelayedexpansion
@echo off
for /f "delims=" %%a in (testprog.in) do (
    set variable=%%a
    if "x!variable:~-4!"=="x.png" (
        set variable=!variable:~0,-4!
    )
    echo.!variable!
)
endlocal

输出:

2005060
1 2 3 4 5      leave this line alone.
2005070
2005080
2005090

请记住，它不会输出空行(尽管它会 执行空行).

Just keep in mind that it won't output empty lines (though it will do lines with spaces on them).

这可能不是问题，具体取决于输入文件中允许的内容.如果有问题，我的建议是开始使用 CygWin 或

That may not be a problem depending on what's allowed in your input file. If it is a problem, my advice is to get your hands on either CygWin or GnuWin32 (or Powershell if you have it on your platform) and use some real scripting languages.

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