what constitutes valid email address

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Booting the LINUX/PPC kernel without Open Firmware

The DT block format This chapter defines the format of the FDT (flattened device tree) passed to the kernel. The properties it contains and the attributes required by the kernel are described in subsequent chapters.Note: The DT block should be

Postfix SASL authentication

The basic SMTP protocol does not have the ability to verify user identity. Although the sender address on the envelope already implies the sender's identity, because the envelope address is too easy to fake, it cannot be used as identity creden. To

C # using regular expression Instances _ Basic application

A regular expression can be viewed as a powerful wildcard character (a universal match symbol). Most people should be familiar with wildcards, for example, when we see an expression such as "SAMS", then any string that starts with SAMS in a text

Key Points of Computer Network review

Chapter 1 Overview Circuit Switching: The bit stream of the entire packet is continuously transferred from the source point to the end point, as if in a pipe. Packet Exchange: The entire packet is first transmitted to the adjacent node, all of which

[SIP Protocol] learning notes for beginners

  Author: gnuhpcSource: http://www.cnblogs.com/gnuhpc/     1. How is the SIP coming and how is it constructed? In general, SIP is a lightweight signaling protocol, which can be used as a signaling for audio, video, and timely information. Speaking

Similarities and differences between TCP, UDP and RTP (RTCP)

Original address: http://www.cnblogs.com/imystr/p/4026639.html OSI Seven layer modelLayer-Functional TCP/IP protocol family in OSIApplication-layer file transfer, email, file service, virtual terminal tftp,http,snmp,ftp,smtp,dns,telnetPresentation

CentOS 6.6 x86_64 RPM package creation tutorial

I. INTRODUCTION to RPM packagesThere are five basic operation functions for the RPM Package: installation, uninstallation, upgrade, query and verification.Linux software packages fall into two categories:1. Binary package: including the rpm

How to use the Linux shell if statement

Original address: http://blog.chinaunix.net/uid-24607609-id-2118151.htmlThe syntax for the most streamlined if command is:if TEST-COMMANDS; then CONSEQUENT-COMMANDS; fiafter the Test-command executes and its return status is 0, the

Getting started with MySQL database

mysql| Data | Getting started with database MySQL database mysql Introduction What is MySQL? MySQL is a multi-user, multi-threaded SQL database, is a client/server architecture application, it consists of a server daemon mysqld and a

C # Introduction to the principle and method of developing terminal-type SMS GSM

C # Introduction to the principle and method of developing terminal-type SMS GSM Young people who haven't sent text messages must belong to the very rare protected animal. Today's well-developed text messages have

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