For instance, to copy a file without echoing any results:
copy c:\test.txt c:\test >nul
Note: redirecting to NUL only suppresses Normal output. It does suppress error messages.
To suppress error messages, redirect output to 2>NUL.
For instance, to delete a file and not display any error messages:
del test.txt 2>NUL
You can also combine the two and suppress normal and error messages in one fatal swoop using
>NUL 2>NUL