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Current Path : /sys/class/tty/ttyS2/subsystem/tty7/subsystem/tty/subsystem/tty20/subsystem/ttyS1/
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Current File : //sys/class/tty/ttyS2/subsystem/tty7/subsystem/tty/subsystem/tty20/subsystem/ttyS1/xmit_fifo_size