How to capture Android device screen using adb?

There are many ways to take a screen shot on Android device.If you are using

Eclipse ,it can be done easily using DDMS. Here is how you can do it by using adb. 

Capture device screen 

$ adb shell screencap -p /mnt/sdcard/screencapture.png
$ adb pull /mnt/sdcard/screencapture.png

Record device screen 

 $ adb shell screenrecord /mnt/sdcard/screenrecord.mp4  

 $ adb pull /mnt/sdcard/screenrecord.mp4