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How does linux change the serial port displayed on the screen
The setserial command can be used to set the serial port.

Serial interface is an extended interface that adopts serial communication mode, which refers to the sequential transmission of data bit by bit. The serial interface is characterized by simple communication lines, and only a pair of transmission lines can realize two-way communication, which greatly reduces the cost. Especially suitable for long-distance communication, but the transmission speed is slow.