Taking Screenshots in Mac OS X

Command-Shift-3: Take a screenshot of the screen, and save it as a file on the desktop

Command-Shift-4, then select an area: Take a screenshot of an area and save it as a file on the desktop

Command-Shift-4, then space, then click a window: Take a screenshot of a window and save it as a file on the desktop

Command-Control-Shift-3: Take a screenshot of the screen, and save it to the clipboard

Command-Control-Shift-4, then select an area: Take a screenshot of an area and save it to the clipboard

Command-Control-Shift-4, then space, then click a window: Take a screenshot of a window and save it to the clipboard

In Leopard and later, the following keys can be held down while selecting an area (via Command-Shift-4 or Command-Control-Shift-4):

Space, to lock the size of the selected region and instead move it when the mouse moves

Shift, to resize only one edge of the selected region

Option, to resize the selected region with its center as the anchor point

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Reverse Engineering : Extract contents from .img file

Unyaffs is a program to extract files from a YAFFS2 file system image. Currently it can only extract images created by mkyaffs2image. Download the source from here . Compiling : Extract the contents into a suitable place and run the following command make Usage : unyaffs [options] <image_file_name> [<extract_directory>] Options: -d detection of flash layout, no extraction -b spare contains bad block information -c <chunk size> set chunk size in KByte (default: autodetect, max: 16) -s <spare size> set spare size in Byte (default: autodetect, max: 512) -t list image contents -v verbose output -V print version Source: Official github repository

JavaScript - Singleton Pattern

The singleton design pattern is probably the simplest and most common pattern in JavaScript. So why should you use the singleton pattern? Encapsulation of members & functions Creates its own Namespace A singleton is a single instance object Encourages code reuse Improves readability because you can logically organise your code The point of a singleton is to only have one instance. A shopping cart is a good example of something that you may want only a single instance of at one time. The simplest form of Singleton is an object literal. This loose form of Singleton cannot be instantiated. All of the members are now accessible through the Singleton variable, accessible through dot notation. var myCart = { self: this , totalCost: 0, totalQty: 0, cart: {}, getCart: function (){ }, updateCart: function (){ } }; alert( "Total cost: ...

Mac Yosemite : Ugly turned out to be Uglier and Ugliest

You might have read my review on Mac OSX Yosemite , The Good, bad and ugly. Now it turned out to be UGLIEST. No more words. Here's the image. If you are on Yosemite, you might be familiar with it. Most of the times, you get stuck on boot logo. I've seen complaints regarding it saying that fellow members are ignorant of it and they deny such possibility, even though many are still facing it. Workarounds suggested by our online friends: Just reboot your mac as many times it takes to your desktop. Boot into safe mode, by holding SHIFT and then reboot. Comment your workaround below, mine is the first one. If you are still on Mavericks, be there till Apple provides a fix for this.

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