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Current Path : /sys/class/tty/tty20/subsystem/tty31/subsystem/ttyS2/subsystem/tty2/subsystem/ttyS1/
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Current File : //sys/class/tty/tty20/subsystem/tty31/subsystem/ttyS2/subsystem/tty2/subsystem/ttyS1/xmit_fifo_size