session activity/inactivity. These groups are only provided for custom setups,
and mainly system services, to allow proper privilege separation.
A video-streaming daemon uid would be a member of "audio" and "video", to get
-access to the sound and video devices, but no "normal" user ever belongs in
-the "audio" group, because he could listen to the built-in microphone with
+access to the sound and video devices, but no "normal" user should ever belong
+to the "audio" group, because he could listen to the built-in microphone with
any ssh-session established from the other side of the world.
/dev/serial/by-{id,path}/ now contains links for ttyUSB devices,
devices - only a single one per product connected, or a real
USB serial number in the device - are always found with the same
name in the by-id/ directory.
-Completely Identical devices may overwrite their names in by-id/
+Completely identical devices may overwrite their names in by-id/
and can only be found reliably in the by-path/ directory. Devices
specified by by-path/ must not change their connection, like the
USB port number they are plugged in, to keep their name.