Question

and exectute some command if file empty

Answer 1

Here’s a sample batch file that does this. You call it with the name of the file you want to check is empty or not:

@ECHO OFF

IF "%~z1"=="0" GOTO FileEmpty
ECHO File is not empty
GOTO End

:FileEmpty
ECHO File is empty

:End

Note that the file must exist in order for this to work. But you can check that easily with IF EXIST