RPi: USB camera as monitor/CCTV without recording

#This program only works with USB cameras.
? sudo apt-get update
> sudo apt-get install guvcview

> sudo service motion stop
> sudo service motion start

#Open your browser and type this to address bar: [your ip address]:8081
#ex: 192.168.1.101:8081

#note: do not use parallel  with fswebcam, opencv etc.