Mac: Mac OS X Screen capturing shortcuts, without using any application

As I am writing blog posts, articles, books and any kind of documents that requires a screen shots on Mac OS, you will find a tool to do that by default packaged with Mac, Greb and preview tools.

Screenshots can be taken by using the Grab application included with OS X. It is located at /Applications/Utilities/Grab.

Preview can also be used to take screenshots, by using the "Take Screen Shot" submenu in the File menu.

Instead of using the applications above, for the sake of productivity, Mac OS X provides a keyboard shortcuts to control the screen shot taking instead of programs, and they are as the following:

1. Command-Shift-3:
   Take a screenshot of the screen, and save it as a file on the desktop
   
   
2. Command-Shift-4:
   then select an area: Take a screenshot of an area and save it as a file on the desktop
   
   
3. Command-Shift-4:
   then space, then click a window: Take a screenshot of a window and save it as a file on the desktop
   
   
4. Command-Control-Shift-3:
   Take a screenshot of the screen, and save it to the clipboard
   
   
5. Command-Control-Shift-4:
   then select an area: Take a screenshot of an area and save it to the clipboard
   
   
6. Command-Control-Shift-4:
   then space, then click a window: Take a screenshot of a window and save it to the clipboard
   
   
7. In Leopard and later,
   the following keys can be held down while selecting an area (via Command-Shift-4 or Command-Control-Shift-4):
   
   
   1. Space, to lock the size of the selected region and instead move it when the mouse moves
   2. Shift, to resize only one edge of the selected region
   3. Option, to resize the selected region with its center as the anchor point