The Mac OS has always made it easy to capture a screen shot. (A screen shot is an image of your computer desktop or an active window.)
This post provides a summary of all the keyboard shortcuts you can use to capture your screen on Mac. (Check HERE for screenshot shortcuts on Linux.)
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Entire screen
Command + Shift + 3
The screen shot will be automatically saved as a PNG file on your Desktop with the filename starting with “Picture” followed by a number (e.g., Picture 1, Picture 2, …)
Command + Control + Shift + 3
The screen shot will be copied to your clipboard, so you can paste it into another program suchas PowerPoint, Word, GIMP.
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Customized area of screen
Command + Shift + 4
A cross-hair cursor will appear and you can click and drag to select the area you wish to capture. When you release the mouse button, the screen shot will be automatically saved as a PNG file on your Desktop following the same naming convention as explained on the first tip above.
Command + CTRL + Shift + 4
A cross-hair cursor will appear and you can click and drag to select the area you wish to capture. When you release the mouse button, you can paste the screen shot to another application.
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Active window
Press and hold
Command + Shift + 4
then tap on the Spacebar.
The cursor will change to a camera, and you can move it around the screen. As you move the cursor over an application window, the window will be highlighted. The entire window does not need to be visible for you to capture it. When you have the cursor over a window you want to capture, just click the mouse button and the screen shot will be saved as a PNG file on your Desktop.
Press and hold
Command + CTRL + Shift + 4
then tap on the Spacebar.
The cursor will change to a camera, which you can move around the screen. As you move the cursor over an application window, the window will be highlighted. The entire window does not need to be visible for you to capture it. When you have the cursor over a window you want to capture, just click the mouse button and you can paste the screen shot into another application.
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Screenshot with tooltip
Command + SHIFT + 4
The trick is simple, you have to keep press (⌘+SHIFT) first. Then hover mouse to make tool tip appear and press (4).
Simple way to do this : a small trick
1. open you screen , for which you want to take screen shot
2. point to tool-tip , it will show that tooltip .
3 then capture whole screen by Command + Shift + 3
4. preview above captured image , and expand to full screen
5. now use Command + Shift + 4 to capture tool-tip
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References and Further reading list