Hello, A USB serial device is identified by the characters "/dev/ttyUSB0". One might call this string a "device on your filesystem" and it can be opened/closed just like any other entry in the filesystem.
An ethernet device is sometimes represented by the string "eth0". Regarding this string "eth0": 1. What does this string represent? Is it a file on a filesystem? (no!) Is it okay for me to call it an "ethernet *device*" 2. Assuming udev is not running, who/what comes up with the name "eth0"? How does that person/thing know how many ethernet devices there are and in what order to enumerate them? What happens if ethernet devices are dynamically added (e.g. a USB ethernet device or a driver being loaded/unloaded)? 3. How does (2) change when udev is running? Thank you, Chris
