Thanks for your quick answer.
I need to make a correction in the translation, because I add it again. Good to know, will be remove within then next hour.
I just recognize you are experimenting with the double hyphen
To the file name, it was only an example to use the epub ext. Maybe "file.ext" is a better description. My intension was mainly to let you know this is a question I become quite often if a normal user try to start with command line.
Edit: You was much faster and you add a remark. Very nice
Thanks a lot!