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How I do a findstr who can find and if he find something he delete the results?

First -- what? I don't think I understand what you're asking.

But, maybe this:

(using findstr syntax from memory)
findstr /c:"your text to search for" c:\yourfile.txt
if not errorlevel 1 del c:\yourfile.txt

thanks men it works but the code is not correct the first line so i make changes:

Sorry my english i am portuguese and i am 13 years old i am learning more about english thanks you are great!