Do you just mean whistling while breathing in and also while breathing out? I can do that, but there’s a short break in the whistle when I switch the airflow direction.
Ie I can whistle a long song without pause, but I can’t whistle a single sustained note without a short but noticeable break in the sustain when I switch from breathing out to breathing in and vice versa.
No, that’s not correct. If you create a new file as root, it will own that file. But editing an existing file doesn’t change the owner or group of that file.