Second time: Ubuntu16.04 system how to screenshot

At first think of writing articles without diagrams, all by the text description, but I was wrong, technical text no diagram how can say clearly, so began to find in the Ubuntu System Tools, Network magic, found this, the following commands can be repeated try:

Ubuntu comes with a software gnome-screenshot that is easy to use and is fully functional, supporting the command line. Briefly described below.

Function
To the screen, window, or custom area.

Gnome-screenshot-w fetching the current active window
Gnome-screenshot-a grabbing a defined area
Gnome-screenshot-b contains the border of a window
Gnome-screenshot-b removing borders
gnome-screenshot-d N waits N seconds
Gnome-screenshot-e additional effects (shadow,border,none)
Gnome-screenshot-i Interactive operation
If only normal to these enough, the next one try!

Second time: Ubuntu16.04 system how