How to delete files in a directory with batch script?

Yes, it is possible. To delete the files, use del .

If you prefer to delete the files using the absolute path, use the %~dp0 variable to get the script folder and enter the target subfolder.

You can iterate over array with extensions and use wildcard to match files with certain extensions.

@echo off

set "subpasta=%~dp0%diretorio\teste\" REM a pasta do batch e subpasta
set "extensoes=txt mp4"               REM separe as extensoes com espaco

for %%i in (%extensoes%) do (
    echo Deletando arquivos do tipo %%i da pasta %subpasta%
    del %subpasta%*.%%i
)

if %errorlevel% EQU 0 (
    echo Operacao realizada com sucesso
) else (
    echo Nao foi possivel deletar um ou mais arquivos
)

Note: To show no output, you redirect the stdout and stderr for null like this: del %subpasta%*.%%i 2> nul     

As it is a sub folder of your root directory, not the need to exit, but I particularly prefer to always use the command with an absolute path for greater security.

del C:\comando\batch\diretorio\teste\*.txt /s

del C:\comando\batch\diretorio\teste\*.mp4 /s

The '/ s' recursively deletes.

Eg, inside the folder has another folder (test / videos) with mp4 files, they will also be erased.

Dai you can continue with your routines!