%pool: pool=system blockSize=256K layoutMap=cluster allowWriteAffinity=no %pool: pool=datapool blockSize=2M layoutMap=cluster allowWriteAffinity=yes writeAffinityDepth=1 blockGroupFactor=256 # gpfstest9 %nsd: nsd=node9_meta_sdb device=/dev/sdb server…

File I/O Introduction     We'll start our discussion of the UNIX System by describing the functions availablefor file I/O-open a file, read a file, write a file, and so on. Most file I/O on a UNIX system can be performed using only five functions: open, re…

Most of the Android user are using their Android phone just for calls, SMS, browsing and basic apps, But form the development prospective, we should know about  Android internal structure. Android uses several partitions (like boot, system, recovery,…

"Everything is a file" describes one of the defining features of Unix, and its derivatives — that a wide range of input/output resources such as documents, directories, hard-drives, modems, keyboards, printers and even some inter-process and net…

头文件 在C++中定义Definition一个类的时候 要用分别的.h和.cpp文件去定义这个类 .h和.cpp成对出现 类的声明declaration和函数原型放在头文件里(.h) 定义这些函数的结构主体就要放在source file 源文件里(.cpp) 要使用在头文件声明的函数/类必须include这个头文件 在定义函数结构主体的时候也需要include头文件 Header = interface(接口) 头文件连接了创造者和代码使用者 声明declaration 表示存在这个东西但是没有…

字体显示效果测试 这一段是为了测试宋体字的显示效果,包括宋体里面自带的英文字体,“This is english,how does it look like?”.这一行是小字.后面几个字是加粗的宋体.标点符号“,.::!” 这一段是为了测试黑体字的显示效果,包括黑体里面自带的英文字体,“This is english,how does it look like?”.这一行是小字.标点符号“,.::!”.微软雅黑是什么样子的呢“,.:!”? This paragraph shows how doe…

http://linux.about.com/library/cmd/blcmdl1_sh.htm http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html Linux / Unix Command: shCommand LibraryNAMEbash - GNU Bourne-Again SHell SYNOPSISbash [options] [file] DESCRIPTIONBash is an sh…

从逻辑上组织代码,将一些有联系,完成特定功能相关的代码组织在一起,这些自我包含并且有组织的代码片段就是模块,将其他模块中属性附加到你的模块的操作叫做导入. 那些一个或多个.py文件组成的代码集合就称为模块.如:os 是系统相关的模块:file是文件操作相关的模块 模块分为三种: 自定义模块 内置标准模块(又称标准库) 开源模块 自定义模块 一.定义与导入模块 一个或多个.py文件组成的代码集合,便是一个模块. 如定义目录: └─module_test │ m1.py │ test.py │ └─…

[目录] 1.os.system(cmd) 2.os.popen(cmd) 3.利用subprocess模块 4.subprocessor模块进阶 [概述] 考虑这样一个问题,有hello.py脚本,输出”hello, world!”:有testinput.py脚本,等待用户输入,然后打印用户输入的数据.那么,怎么样把hello.py输出内容发送给testinput.py,最后testinput.py打印接收到的”hello, world!”.下面我来逐步讲解一下shell的交互方式. hell…

Background C++ is one of the main development languages used by many of Google's open-source projects. As every C++ programmer knows, the language has many powerful features, but this power brings with it complexity, which in turn can make code more…