//sys/class/tty/tty21/subsystem/ttyS0/subsystem/tty30/subsystem/tty37/subsystem/tty9/subsystem/tty38/subsystem/tty1/subsystem/tty45/subsystem/tty20/subsystem/tty37/subsystem/tty31/subsystem/tty45/subsystem/tty21/subsystem/ttyS2/subsystem/tty25/subsystem/tty4/subsystem/tty52/dev