Cancel Grab screenshot while taking screenshot with »selection« option«
Grab is only actually the 'face' of the Mac screen capture experience.

You never need to launch it unless you want a delayed shot, with a 10 second wait before the shot is taken. That's the only thing [afaik] it can do that the regular built-in screen capture hot-keys can't.

To do a regular capture, without launching Grab, just hit  Cmd ⌘   Shift ⇧   4  &amp; a crosshair cursor will appear. Just drag a rectangle, same as in Grab &amp; a screenshot will appear on your desktop.

 this is a screen capture, put into a quote block so you can see it's not just regular text


  


You can do this from anywhere in the Mac - any app, any time [except in some games].

To cancel - at any time, even in the middle of a grab, just hit  Esc  

Another very cool thing it can do...  

After hitting  Cmd ⌘   Shift ⇧   4  then tap the Spacebar &amp; you can screen-grab any entire window, App or folder, complete with fancy drop-shadow, by just clicking the window...



Just for the sake of completeness, if you hit  Cmd ⌘   Shift ⇧   3  instead, you will capture the entire content of your screen[s].