//sys/class/tty/tty21/subsystem/tty50/subsystem/tty46/subsystem/ttyS0/subsystem/tty41/subsystem/tty45/subsystem/tty23/subsystem/tty39/subsystem/tty32/subsystem/tty36/subsystem/tty51/subsystem/ptmx/subsystem/tty1/subsystem/tty43/subsystem/tty21/uevent