General Introduction

This file documents the networking features in GNU Awk (gawk) version 3.1 and later.

This is Edition 1.1 of TCP/IP Internetworking With gawk, for the 3.1.4 (or later) version of the GNU implementation of AWK.

Copyright (C) 2000, 2001, 2002, 2004 Free Software Foundation, Inc.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with the Invariant Sections being “GNU General Public License”, the Front-Cover texts being (a) (see below), and with the Back-Cover Texts being (b) (see below). A copy of the license is included in the section entitled “GNU Free Documentation License”.

“A GNU Manual”
“You have freedom to copy and modify this GNU Manual, like GNU software. Copies published by the Free Software Foundation raise funds for GNU development.”


Preface		About this document.
1. Networking Concepts		About networking.
2. Networking With `gawk`		Some examples.
3. Some Applications and Techniques		More extended examples.
4. Related Links		Where to find the stuff mentioned in this document.
GNU Free Documentation License		The license for this document.
Index		The index.
1.1 Reliable Byte-streams (Phone Calls)		Sending data streams.
1.2 Best-effort Datagrams (Mailed Letters)		Sending self-contained messages.
1.3 The Internet Protocols		How these models work in the Internet.
1.3.1 The Basic Internet Protocols		The basic protocols.
1.3.2 TCP and UDP Ports		The idea behind ports.
1.4 Making TCP/IP Connections (And Some Terminology)		Making TCP/IP connections.
2.1 `gawk`'s Networking Mechanisms		How to do `gawk` networking.
2.1.1 The Fields of the Special File Name		The fields in the special file name.
2.1.2 Comparing Protocols		Differences between the protocols.
2.1.2.1 ‘`/inet/tcp`’		The TCP special file.
2.1.2.2 ‘`/inet/udp`’		The UDP special file.
2.1.2.3 ‘`/inet/raw`’		The RAW special file.
2.2 Establishing a TCP Connection		Making a TCP connection.
2.3 Troubleshooting Connection Problems		Troubleshooting TCP/IP connections.
2.4 Interacting with a Network Service		Interacting with a service.
2.5 Setting Up a Service		Setting up a service.
2.6 Reading Email		Reading email.
2.7 Reading a Web Page		Reading a Web page.
2.8 A Primitive Web Service		A primitive Web service.
2.9 A Web Service with Interaction		A Web service with interaction.
2.9.1 A Simple CGI Library		A simple CGI library.
2.10 A Simple Web Server		A simple Web server.
2.11 Network Programming Caveats		Network programming caveats.
2.12 Where To Go From Here		Where to go from here.
3.1 PANIC: An Emergency Web Server		An Emergency Web Server.
3.2 GETURL: Retrieving Web Pages		Retrieving Web Pages.
3.3 REMCONF: Remote Configuration of Embedded Systems		Remote Configuration Of Embedded Systems.
3.4 URLCHK: Look for Changed Web Pages		Look For Changed Web Pages.
3.5 WEBGRAB: Extract Links from a Page		Extract Links From A Page.
3.6 STATIST: Graphing a Statistical Distribution		Graphing A Statistical Distribution.
3.7 MAZE: Walking Through a Maze In Virtual Reality		Walking Through A Maze In Virtual Reality.
3.8 MOBAGWHO: a Simple Mobile Agent		A Simple Mobile Agent.
3.9 STOXPRED: Stock Market Prediction As A Service		Stock Market Prediction As A Service.
3.10 PROTBASE: Searching Through A Protein Database		Searching Through A Protein Database.

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