Awk scripts for reading and editing Ubuntu /etc/network/interfaces file (Part 2/2)

For modifying the /etc/network/interfaces file, I use another script and it is slightly more complicated.

Awk scripts for reading and editing Ubuntu /etc/network/interfaces file (Part 1/2)

It is pretty straightforward to setup permanent network configuration on Ubuntu 8.04. All you need is to edit /etc/network/interfaces file and a very thorough tutorial is given in http://www.cyberciti.biz/faq/setting-up-an-network-interfaces-file/ to show you how manually edit for DHCP, static and promiscuous mode. However, I cannot find any command line utility for configuring permanent network setup.

So here are couple awk scripts for reading and writing /etc/network/interfaces file. I hope someone will find it useful, especially for integrating with other programs.

Internet Explorer Debugger – The way it reports errors is misleading

One of my many annoyances of IE is the way it reports Javascript errors. It is misleading and it brings confusion. One of the typical errors is ‘Object Expected’, it generally means reference to an object is undefined. The common cause is a function hasn’t been declared or some syntax errors within.

Ajax/Prototype/Prototype-UI: How to setup Ajax.PeriodicalUpdater with UI.Window

This tutorial shows you how to create a Prototype-UI window with Ajax.PeriodicalUpdater. Suppose you need to create an Ajax window and the content is constantly updating. My preferable approach is to wrap both the UI.Window and Ajax.PeriodicalUpdater into one object. To combine PeriodicalUpdater with UI.Window together, the PeriodicalUpdater must be stopped when the window is closed. In order to do that, the UI.Window close event handler must be overridden and the PeriodicalUpdater object is visible to the handler.

Ajax/Prototype: Use onComplete to separate Javascript client code from HTML page

Suppose that you use Ajax.Updater to update the HTML content inside a DOM element. Usually, the HTML forms or table entries require a bit of embedded Javascript code for the event handlers. However, using the onComplete property can give a nice separation between the HTML page and Javascript code.

Prototype-UI: A quick start guide on Ajax Windows

Here is a short tutorial showing you how to use Prototype-UI to create Ajax windows and control the properties between windows.

Introduction
There are many window based Ajax frameworks out there in the market, ZK, Backbase, Ext-JS, YUI, GWT, etc. It depends on whether your web application requires to be client or server centric or a bit of both and the complexity of it. They all need a bit of learning curve. Recently, I came across another window based Ajax product, Prototype-UI, which is based on the well known Prototype and Scriptaculous libraries. Prototype-UI is a client centric and it is an extension work on previously known as PCW window library.

Building the latest Intel ixgbe driver (1.9.0) on FreeBSD 7.1

This is a short note of what needed to be changes to get the Intel ixgbe driver build for the FreeBSD 7.1 kernel. I needed to build a product, INE Ultra, for a customer and the product is built on FreeBSD 7.1 with an Intel 10 Gigabit XF SR Dual Port Ethernet card.

When I booted the machine, there were no sign of Intel network devices apart from the motherboard ones. Then I found out, the card requires ixgbe driver which is not configured as part of the kernel compilation.

Install and Boot Ubuntu from a Compact Flash card

I have been trying to install Ubuntu 8.04 LTS on a Compact Flash card and boot from it. At first, I thought the whole exercise would be straightforward. The hardware I use is a Jetway Mini-ITX J7F2 board connected with a daughter board AD3RTLAN-G which provides 3 extra Gigabits ethernet ports. The chassis is a LinITX M200 with a 20 x 2 USB LCD front panel, 2 x USB ports and a CF reader which connects to the IDE bus and a pico power supply. Here is a photo of it.

CSS SyntaxHighlighter 2.0: short tutorial on how to create your own syntax highlighter

Introduction

This is a tutorial showing you how to create your own syntax highlighter using CSS SyntaxHighlighter 2.0. Before reading this tutorial you need to know regular expression pretty well.

Malformed HTTP Protocol from www.assoc-amazon.com

Again, I was diagnosing HTTP protocol traffic on my local network and I noticed something really strange that disturbed the HTTP protocol analyser module in AppQoS. A serious malformed response packet was found from www.assoc-amazon.com. The response headers were formed without probably ended with CR, only LF and the misspell of the ‘Connection’ header. Here shows an example of the response packet from the site using Wireshark/Ethereal.