Computer Systems A Programmer's Perspective Second Edition This is a good place to pause and make sure you understand the distinction between a program and aprocess. A program is a collection of code and data; programs can exist as object modules on…

Introduction to text manipulation on UNIX-based systems https://www.ibm.com/developerworks/aix/library/au-unixtext/index.html     A basic tenets of UNIX philosophy is to create programs (or processes) that do one thing, and do that one thing well. It…

在闲暇时间做了一个TOTP相关的开源项目,在项目初步完成之余,我尝试对[RFC6238]文档进行了翻译,供大家参考与查阅,若有不妥之处,还望各位前辈海涵斧正. [RFC6238] : Time-Based One-Time Password Algorithm 开源项目地址:tick-authenticator 文章概要 This document describes an extension of the One-Time Password (OTP) algorithm, namely th…

这章内容就是“provides a whirlwind tour of the UNIX System from a programmer's perspective”. 其实在看这章内容的时候,已经先看过了Chapter7~Chapter13,回头再看看这样的综述介绍. 1.2 UNIX Architecture 主要就了解下面这张图即可: 在一般UNIX operating system中谁在哪层来调用谁. 1.3 Logging In 操作系统根据/etc/passwd中的信息来判断log…

A cloud system may create physical resource tags to store relationships between cloud computing offerings, such as computing service offerings, storage offerings, and network offerings, and the specific physical resources in the cloud computing envir…

小结: 1.栈内存 为什么快? Due to this nature, the process of storing and retrieving data from the stack is very fast as there is no lookup required, you just store and retrieve data from the topmost block on it. 堆内存 慢于栈内存 ,但存储空间动态,使用指针访问 Heap is used for dynam…

A process is an executing instance of an application. What does that mean? Well, for example, when you double-click the Microsoft Word icon, you start a process that runs Word. A thread is a path of execution within a process. Also, a process can con…

Posted: 2009-04-28 15:20 Tags: Python Note Much of the "What Happens When you Execute a Command?" is based on information in http://en.wikipedia.org/wiki/Redirection_(computing) so go there for the latest version. This post is released under the…

https://ttboj.wordpress.com/2016/02/15/debugging-golang-programs/ I’ve been writing a lot of golang lately. I’ve hit painful problems in the past. Here are some debugging tips. Hopefully they help you out. I bet you don’t know #2. #0 Use log.Printf:…

Linux, like all Unix uses user and group identifiers to check for access rights to files and images in the system. All of the files in a Linux system have ownerships and permissions, these permissions describe what access the system's users have to t…