root@smoke-GS70-2PC-Stealth:/dev# for I in /sys/class/video4linux/*; do cat $I/name; done
root@smoke-GS70-2PC-Stealth:/dev# ll /sys/class/video4linux/
总用量 0
drwxr-xr-x  2 root root 0 6月  26 21:27 ./
drwxr-xr-x 73 root root 0 6月  26 21:24 ../
lrwxrwxrwx  1 root root 0 6月  26 21:27 video0 -> ../../devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4/1-1.4:1.0/video4linux/video0/
lrwxrwxrwx  1 root root 0 6月  26 21:27 video1 -> ../../devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4/1-1.4:1.0/video4linux/video1/
root@smoke-GS70-2PC-Stealth:/dev# v4l2-ctl --list-devices
BisonCam, NB Pro: BisonCam, NB  (usb-0000:00:1a.0-1.4):
	/dev/video0
	/dev/video1
	/dev/media0
smoke@smoke-GS70-2PC-Stealth:~$ cheese