以下みたいな形で設定してログインする。
hogehoge@pc:~$ cu -s 9600 -l /dev/ttyUSB0
cu: open (/dev/ttyUSB0): Permission denied
cu: /dev/ttyUSB0: Line in use
一般ユーザでやるときはパーミッションを変える
hogehoge@pc:~$ sudo chmod 666 /dev/ttyUSB0
hogehoge@pc:~$ cu -s 9600 -l /dev/ttyUSB0
以上
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