As a general rule, I am very much for making use of the built-in features of the OS I am using - especially if they are well implemented - and this goes for taking screen shots as well.
I have been a Ubuntu user for quite a while now (few good years) -and for a long time I have used the Print Screen on my keyboard to take screen shots in Ubuntu. This takes a screen shot of the entire screen area. Next step was to fire my image editor (Shotwell, of course) and crop the image as I need it - and this was the case most of the times.
Never looked closer into options, and on the other hand - I did not want a dedicated app sitting on my task panel just for this purpose only. After digging a little bit deeper (thanks Google!) - here's what I've got:
Colons can be used to align columns.
|Print Screen||takes a screen shot of the whole screen area|
|Alt + Print Screen||takes a screen shot of the focused window|
|Shift + Print Screen||it lets you select a screen area before taking a screen shot|
There are a few more key combinations that lets you copy to clipboard. Although I am not using those very often, they can come in handy:
|Shift + Ctrl + Print Screen||copies selected area to clipboard|
|Ctrl + Print Screen||copies whole screen area to clipboard|
|Ctrl + Alt + Print Screen||copies a screen shot of the focused window to the clipboard|
And there ya go - no more cropping of screen shots!