📁 sys/dev/char/4:82/device/subsystem/drivers/port/serial8250:0.21/tty/ttyS21/subsystem

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📁 / / sys / dev / char / 4:82 / device / subsystem / drivers / port / serial8250:0.21 / tty / ttyS21 / subsystem

📍 /sys/class/tty