iOS

Advanced Memory Management

Programming Guide

http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/MemoryMgmt/Articles/MemoryMgmt.html#//apple_ref/doc/uid/10000011-SW1

Cocoa Design Patterns

https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/CocoaFundamentals/CocoaDesignPatterns/CocoaDesignPatterns.html#//apple_ref/doc/uid/TP40002974-CH6-SW6

Bash

http://zh.wikipedia.org/wiki/Bash