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I know the title of the question sounds a bit silly, but that's the best I could think of :)

As far as I understand, if I have some serial device connected with USB - let's say I connect my Arduino to my PC with a USB-to-serial adapter - now I can open /dev/ttyUSB0 with open() and read and write from/to the device. (correct me if I'm wrong there). Basically this is the same as using PuTTY in Windows.

My question is - from the point of view of the OS, is this a TTY? so is there a line discipline applied to the input and output that comes from/goes to the device?

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