Tutorial Proggraming Free

tutorial - OpenSource HTTP Load Tester and Benchmarking Utility - Siege

Siege is an open source stress / regression test and benchmark utility. It can stress a single URL with a user defined number of simulated users or it can read many URLs into memory and stress them simultaneously.

Siege reports the total number of hits recorded, bytes transferred, response time, concurrency, and return status. Most features are configurable with command line options which also include default values to minimize the complexity of the program's invocation.

Siege allows you to stress a web server with 'n' number of users for 't' number of times, where n and t are defined by the user. It records the duration time of the test as well as the duration of each single transaction.

Siege reports the number of transactions, elapsed time, bytes transferred, response time, transaction rate, concurrency and the number of times the server responded OK, that is status code 200. Siege was designed and implemented by Jeffrey Fulmer in his position as Webmaster for Armstrong World Industries.

The latest version of siege can be obtained via anonymous ftp: siege-latest.tar.gz

Installation:
Extract the source code using command: tar -zxvf siege-latest.tar.gz

   $ ./configure
      --with-ssl=/some/dir -- where dir is where you installed ssl, this flag is used to enable https protocol.
   $ make
   $ make uninstall (if you have an older version installed in PREFIX)
   $ make install

Using: Here is the simple example of using siege

# siege --concurrent=50 --internet --benchmark --time=20m http://www.someurl.com/index.html

Check siege man pages for more options

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source:http://linuxpoison.blogspot.com/2009/08/135781757181.html

tutorial - HowTo Install Firefox, Thunderbird and SeaMonkey on Ubuntu using Ubuntuzilla

Ubuntuzilla allows the user to install the latest versions of Firefox, SeaMonkey, and Thunderbird on Ubuntu OS.

The Ubuntuzilla software is a python script that allows the user to install the latest versions of Mozilla Firefox, Mozilla SeaMonkey, and Mozilla Thunderbird on Ubuntu Linux. Ubuntuzilla has a support forum on the Ubuntu Forums in the 3rd party projects area, which you are encouraged to use if you have any questions, comments, or suggestions.

Here are some key features of "Ubuntuzilla":
* Automatically detects and downloads the newest Firefox, Thunderbird, SeaMonkey release from the Mozilla servers
* Allows you to make a choice of language for Firefox or Thunderbird
* Verifies the GPG signature (assures package integrity against malicious tampering or corrupt download) for Firefox or Thunderbird
* Verifies the MD5 sum for SeaMonkey
* Makes a date-stamped back-up of your Firefox, Thunderbird, SeaMonkey profile data
* Automatically integrates Firefox plugins that you have installed from the Ubuntu repositories
* Installs the new Firefox in /opt/firefox, Thunderbird in /opt/thunderbird, SeaMonkey in /opt/seamonkey
* Creates a SeaMonkey menu item in ''Applications -> Internet'' menu
* Checks all steps for successful execution
* Has a 'remove' action to remove the official Mozilla build and restore system to pre-installation state.
* Installs an update checker job that periodically performs automatic checks for new versions of Firefox, Thunderbird, or Seamonkey.
* Automatically checks for the latest Ubuntuzilla release and updates itself, to keep up with possible changes in the Mozilla website and release servers.
* Comes conveniently packaged in a .deb for easy installation
* Includes a very helpful man page, for those who don't like to read websites.

Install Ubuntuzilla
Install Dependencies: sudo apt-get install libstdc++5 libnotify-bin
Download deb package for Ubuntuzilla.
Double click to install the package. You can also use terminal to do the installation.

sudo dpkg -i /path/to/ubuntuzilla-4.6.1-0ubuntu1-i386.deb

Installing Firefox in Ubuntu
You’ll need to use a terminal to let Ubuntuzilla guide you through the installation.
Run this command to start: ubuntuzilla.py -a install -p firefox

Near the end of the process you should see The new Firefox version 3.5 has been installed successfully. Similarly if you want to install thunderbird or seamonkey, use following command

ubuntuzilla.py -a install -p thunderbird
ubuntuzilla.py -a install -p seamonkey

Removal:
Enter this command to run the script (choose one depending on which software you want to remove; copy and paste to avoid typos):

ubuntuzilla.py -a remove -p firefox
ubuntuzilla.py -a remove -p thunderbird
ubuntuzilla.py -a remove -p seamonkey

Updates
To install the automatic update checker, just run the installation, follow the prompts at the end of installation and choose 'yes' to enable automatic update checking. If you have already installed the Mozilla software at an earlier time, and just want to enable the automatic update checking, you can run Ubuntuzilla with action "installupdater" to install the updater job separately. Use the following command (choose one depending on which software you want to check for updates; copy and paste to avoid typos):

ubuntuzilla.py -a installupdater -p firefox
ubuntuzilla.py -a installupdater -p thunderbird
ubuntuzilla.py -a installupdater -p seamonkey

source:http://linuxpoison.blogspot.com/2009/08/135781757117810.html

tutorial - Open Source Java Library for Bluetooth - BlueCove

BlueCove is a JSR-82 J2SE implementation that currently interfaces with the Mac OS X, WIDCOMM, BlueSoleil and Microsoft Bluetooth stack found in Windows XP SP2 and newer. Originally developed by Intel Research and currently maintained by volunteers.

BlueCove runs on any JVM starting from version 1.1 or newer on Windows Mobile, Windows XP and Windows Vista, Mac OS X. Since version 2.1 BlueCove distributed under the Apache Software License, Version 2.0.

Linux BlueZ support added in BlueCove version 2.0.3 as additional GPL licensed module

Installation

BlueCove rely upon already installed native Bluetooth stack that comes with you operating system or Bluetooth USB device.

Installation of the binary (already compiled) version of BlueCove is as follows:

Download BlueCove binary release

Add bluecove.jar to your classpath

Also add bluecove-gpl.jar to your classpath if you are running application on Linux

source:http://linuxpoison.blogspot.com/2009/08/135781757117958.html

tutorial - Howto label Linux partition

In linux, to label a partition, there are 3 tools that can be used. The tools are e2label, tune2fs and mke2fs.

To use e2label to label the second partition of the first hardisk with label DATA:
# e2label /dev/sda2 DATA

To use tune2fs to do the similar job as above:
# tune2fs -L DATA /dev/sda2

The third tool, mke2fs is actually a tool to build ext2/ext3 filesystem. So, if you want to build the partition's filesystem as ext2/ext3 and at the same time label it, this command can be used. Be careful though, because it will delete all existing data on that particular partition
# mke2fs -L DATA /dev/sda2

To view the label that you have set, there are 3 ways which are using e2label, blkid and viewing /dev/disk/by-label.

To check using e2label:
# e2label /dev/sda2
DATA

blkid tool is even more useful, because it can list out all the partitions that you have in the machine together with their labels,uuid and filesystem type:
# blkid
/dev/sda1: LABEL="/" UUID="1CC08F13C08EF276" TYPE="ext3"
/dev/sda2: LABEL="DATA" UUID="2063f830-fe5d-438e-b727-571b313cb89e" TYPE="ext3"
/dev/sda3: TYPE="swap" LABEL="SWAP" UUID="3e266b53-42e0-4f09-8fe3-d1cf79cb5d37"

To view the /dev/disk/by-label
# ls -l /dev/disk/by-label
total 0
lrwxrwxrwx 1 root root 10 2009-07-24 05:38 / -> ../../sda1
lrwxrwxrwx 1 root root 10 2009-07-24 05:38 DATA -> ../../sda2
lrwxrwxrwx 1 root root 10 2009-07-24 05:38 SWAP -> ../../sda3

Note that the label will stay with the partition although the disk is moved to another computer.

To use it in /etc/fstab:
LABEL=/ / ext3 defaults 1 1
LABEL=DATA /DATA ext3 defaults 1 2
LABEL=SWAP swap swap defaults 0 0

source: http://linuxwave.blogspot.com/2009/07/labeling-linux-partition.html

source:http://linuxpoison.blogspot.com/2009/08/135781757115594.html

tutorial - Creating Magazines, Newspapers, Posters, Calendars and other printed publication - Scribus

Scribus is a desktop publishing (DTP) application, released under the GNU General Public License as free software. It is based on the free Qt toolkit, therefore native versions are available for Linux, Unix-like, Mac OS X, OS/2, and Microsoft Windows. It is known for its broad set of page layout features comparable to leading non-free applications such as Adobe PageMaker, PagePlus, QuarkXPress or Adobe InDesign.

Scribus is designed for flexible layout and typesetting and the ability to prepare files for professional quality image setting equipment. It can also create animated and interactive PDF presentations and forms. Example uses include writing small newspapers, brochures, newsletters, posters and books.

Installation of Scribus
The installation process of Scribus depends on the distribution of Linux/Unix that you are using. This is the case just like it is for any program you may wish to install. The following are examples for how to install Scribus on various distributions:

Linux Distribution	Install Method
Debian	`apt-get install scribus` or preferably use one of the graphical front-ends such as "Synaptic" that handle "Recommends" correctly. For further information please read How to use the Scribus Debian Repository
Gentoo	`emerge scribus`
PLD	`poldek -i scribus`
RedHat/Fedora	`rpm -Uvh ./scribus-1.x.rpm`
Slackware	Install from source, until 1.2 is part of Slackware
SuSE	Use Yast2 for installation, OR, `rpm -Uvh ./scribus-1.x.rpm`
Other OS	Install Method
FreeBSD	`cd /usr/ports/print/scribus; make install`
Mac OSX	Please refer to the Cross Platform section
Windows™	Please refer to the Cross Platform section

Depending on the version of your distribution, there is the possiblity that you may need to upgrade various dependencies of Scribus and the above commands should make sure the required packages are installed.

source:http://linuxpoison.blogspot.com/2009/08/13578175715122.html

tutorial - Linux "VISA" Credit Card

Use your Linux VISA card for everyday purchases, just as you would any card. Each time you buy lunch, gas, a new game box, or a big screen: a portion of your “cardholder rewards” becomes a charitable donation to Free and Open Source Software (F/OSS). All at no cost to you. By combining the “rewards” from thousands of cardholders, Linux Fund has distributed over half a million dollars in grants to F/OSS projects since 1999.

Linux Fund is a 501(c)(3) nonprofit organization that provides financial and advisory support to the free and open software community. Linux Fund has given away over 3/4 million dollars to open source events and development since its founding in 1999 using funds earned by its line of rewards credit cards and direct donations.

Prior to receiving the 501(c)(3) letter, the principal funding source had been an affinity credit card program with credit cards bearing a graphic of Tux, the Linux Penguin. Visa cards are currently offered in the USA by US Bank, and a Master Card is offered in Canada by MBNA/Bank of America of Canada.

Check more at: http://www.linuxfund.org/

source:http://linuxpoison.blogspot.com/2009/08/135781757115089.html

tutorial - Optimize the disk space by removing unnecessary locale data - localepurge

The package localepurge (version 0.5.9) is just a simple script to recover disk space wasted for unneeded locale files and localized man pages (interpret - language files). After first use, it will automatically be invoked upon completion of any apt installation run.

Note: This tool is a hack which is *not* integrated with Debian based package management systems and therefore is not for the faint of heart. This program interferes with the Debian based package management and can provoke strange, but usually harmless, behavior of programs related with apt/dpkg like dpkg-repack, debsums, reportbug, etc. Responsibility for its usage and possible breakage of your system therefore lies in the sysadmin's (your) hands.

However, this very easy and simple script can and will save you a few hundred megabytes of hard drive space.

Each and every application or package that you install on your system usually contain many locales (language files) which are not the language you understand or use daily. these locales data are installed by default and can takes up hundreds of megabytes of hard drive space, depending on which application or package you install.

so why let these useless data files reside on our system? we do not need them so let's purge them:

From a terminal, type: sudo apt-get install localepurge

During the install, you will receive a prompt for your language. The language selections are in two digit codes, (for example: “en” for English.) scroll down to your language and once it's highlighted, click the “space bar” to select it. Note: You may see several entries for your language, you only need to select the top most entry.)

Once localepurge has finished installing, from the same terminal, type: sudo localepurge

It will run and inform you how much space it just saved you.

That's it, one single line to install localepurge. After the first run, it will automatically remove unnecessary locale data files whenever you install new applications or packages without your intervention.

source:http://linuxpoison.blogspot.com/2009/08/13578175713876.html

tutorial - HowTo create Ubuntu Bootable USB Flash Drive - uSbuntu

uSbuntu Live Creator is a free program for Microsoft Windows that will allow users to easily create a bootable USB key with Ubuntu on it.

uSbuntu Live Creator also offers an exclusive option of automatic virtualization to launch directly Ubuntu in Windows without any configuration nor installation.

Anybody can use uSbuntu Live Creator. It's really easy to use and you don't have to be a computer geek, install remotely from managed servers, or even have a CD-ROM drive!

Features of "uSbuntu Live Creator":
· Create bootable USB device from Ubuntu, Kubuntu and Xubuntu
· Enable persistency of your data
· Launch Ubuntu directly in Windows with a special Portable VirtualBox
· Hide created files on the key
· Automatically configure keyboards (supports French, canadian and US keyboards)

Requirements:
· 256 MB free RAM memory
· Local admin privileges to launch VirtualBox

Improvements :
· Supports Ubuntu 9.04, Linux Mint and CrunchBang
· Creating a contextual menu to launch uSbuntu
· New language available : Italian
· Updated VirtualBox to version 2.2.0
· Great improvement of the launchers for VirtualBox
· Native creation of VMDK
· Formatting time is now adaptive
· A special crash log are created after a crash

Download uSbuntu Live Creator 1.5 for Windows and Instantly Create Ubuntu bootable USB flash drive.

step 1 : launch the uSbuntu Live Creator and choose a USB key or drive in the list
step 2 : select a ISO file or CD of Ubuntu/KubuntuXubuntu 8.10 Intrepid Ibex
step 3 : choose the size of persistency data (usually more than 250MB)
step 4 : check the options you want
step 5 : click the thunder to start the creation

source:http://linuxpoison.blogspot.com/2009/08/13578175717735.html

tutorial - Twitter & Indenti Client for KDE

choqoK is a quick and efficient micro-blogging client for the K Desktop Environment. It currently supports the Twitter.com and Identi.ca services. The name comes from an ancient Persian word that means sparrow.

Feature:
    * Supporting Twitter.com micro-blogging service.
    * Supporting Identi.ca micro-blogging service. (Using its Twitter compatible API)
    * Supporting self hosted Laconica websites. (Using its Twitter compatible API)
    * Supporting User + His/Her Friends time-lines.
    * Supporting @Reply time-lines.
    * Support for send and receive direct messages.
    * Twitpic.com integration.
    * Supporting Multiple Accounts simultaneously.
    * Supporting search APIs for all services.
    * KWallet integration.
    * Ability to make a quick tweet with global shortcuts. (Ctrl+Meta+T)
    * Ability to notify user about new statuses text, with KNotification or Libnotify.
    * Support for shortening urls with more than 30 characters.(shorten on paste)
    * Support for configuring status lists appearance.
    * and other configuration options...

Installation:
Kubuntu | Also available in official repositories
OpenSuSE
Fedora
Mandriva
Archlinux | Also available in community repository
Gentoo

source:http://linuxpoison.blogspot.com/2009/08/1357817571750.html

tutorial - Monitor Changes to Files/Folders/Process/Website/Email etc .. using Specto

Specto is a desktop application that will watch configurable events (such as website updates, emails, file and folder changes, system processes, etc) and then trigger notifications.

For example, Specto can watch a website for updates (or a syndication feed, or an image, etc), and notify you when there is activity (otherwise, Specto will just stay out of the way). This changes the way you work, because you can be informed of events instead of having to look out for them.

Installation:
OpenSuSe user can use "1-click" installer to install Specto
OpenSuSe 11.1 - Here

After successful installation go to terminal and type command: specto to start the application

Specto interface is clean and simple which makes it easy to use and add the events that needs to be monitor, any changes to the events (like file got modified or folder got deleted etc ..) make specto to trigger the notification on your system tray, something like ...

source:http://linuxpoison.blogspot.com/2009/08/135781757119369.html

tutorial - Fast & Simple way to Share Files and Folders - Meiga

Of course, Meiga goal is not to replace Samba. Samba is a mature file sharing technology for Local Area Networks, but it’s a little bit inconvenient for sharing files to the Internet.

I’m sure you’ve experienced problems with Samba more than one time, specially *that* time when you want to share some pictures to a friend with a laptop in the same room as you. Wouldn’t be convenient just to have a small web server and tell him/her “hey, just go to http://192.168.1.1:8001/pictures“? That’s what Meiga does (by the moment).

In addition, you can do the same but sharing to the Internet if you have an UPnP capable router. You don’t need to bother about port redirections, configurations or computer not finding themselves in the network. Just share, copy the address (with the copy icon) and paste it on a chat or IM. That’s all.

Meiga is lightweight, easy to use, network friendly and also application friendly. It's written in a mix of Vala and pure C code, using existing Gnome technologies to perform its tasks: libsoup is used as a simpler alternative to fat web servers, libgupnp is in charge of doing port redirections if the network router supports UPnP, and DBUS exposes a public API to allow the GUI and third party applications to control what is served. Some advanced publishing features are already implemented, like the feed server that can render an RSS view of a given directory.

Installation:
Ubuntu Hardy (i386): meiga_0.2.1-1_i386.deb
Ubuntu Intrepid (i386): meiga_0.2.1-1_i386.deb
Ubuntu Jaunty (i386): meiga_0.2.1-1_i386.deb

Meiga screenshot (shares)

source:http://linuxpoison.blogspot.com/2009/08/13578175719123.html

tutorial - Data Encryption With JavaScript: jCryption

Normally if you submit a form and you don’t use SSL, your data will be sent in plain text.

In short words jCryption is a javascript HTML-Form encryption plugin, which encrypts the POST/GET-Data that will be sent when you submit a form.

jCryption uses the Multiple-precision and Barrett modular reduction libraries for the calculations and jQuery is used for the rest. jCryption is completly free and dual licensed under the MIT and GPL licenses like jQuery.

jCryption was tested with Internet Explorer 6 +, Mozilla Firefox 3+, Safari 3, Opera 9+, Google Chrome.

Features:
    * RSA form data encryption up to 2048 bit
    * AjaxSubmit supported
    * no SSL required
    * easy to install, use and extend
    * doesn’t block the browser on calculations

Sample:
Just call jCryption on your form: $("#normal").jCryption();
Download jCryption - Here

source:http://linuxpoison.blogspot.com/2009/08/135781757111868.html

tutorial - Data Backup and Synchronization using Conduit (OpenSuSe)

Conduit is a synchronization application for GNOME. It allows you to synchronize your files, photos, emails, contacts, notes, calendar data and any other type of personal information and synchronize that data with another computer, an online service, or even another electronic device. There is no command line required. You are good to go as long as you know how to drag and drop.

Installing Conduit: OpenSuSe user can use "1-click" installer to install Conduit
OpenSuSe 11.1 - here
OpenSuSe 11.0 - here

Running Conduit:
Open Conduit (Applications → Utilities → Conduit Synchronizer)
You will see something like ...

Conduit’s main window consists of two panes: the left pane contains a list of supported services (called Data providers), while the right pane (called Canvas) is used to define synchronization rules.

Conduit supports quite a few data providers, including ever-popular Tomboy, F-Spot, Box.net, Flickr, Gmail, and others. Of course, Conduit is capable of syncing individual files and folders. When working with different data providers, it’s important to keep in mind that not all of them support two-way synchronization.

Once you are done, right click on the canvas and select “Synchronize this group“. Synchronization will start. The whole process will depend on the number of files, the file size and the speed of your Internet connection.

As any synchronization tool worth its salt, Conduit provides a way to resolve synchronization conflicts, and you can configure its behavior in the Edit → Preferences dialog window under the Configuration tab.

source:http://linuxpoison.blogspot.com/2009/08/135781757117588.html

tutorial - Userspace Bandwidth Shaper (Management) - trickle

As with any finite resource, it is often necessary to apply policies to the shared usage of network resources.

Existing solutions typically implement this by employing traffic management in edge routers. However, users of smaller networks regularly find themselves in need of nothing more than ad-hoc rate rate limiting. Furthermore,the networks in question are typically unmanaged, with no network administrator(s) to manage complicated traffic management schemes.

Trickle fills this gap by providing a simple and portable solution to rate limit the TCP connections of a given process or group of processes.

Trickle works by taking advantage of the Unix dynamic loader's preloading functionality to interposition itself in front of the libc API interfaces that are used for sending and receiving data through network sockets.

Trickle then performs traffic shaping by delaying and truncating socket I/Os. Trickle runs entirely in user space, does not require administrator privileges and is portable across a wide variety of Unix-like platforms. Instances of Trickle can cooperate, even across networks. This allows for the specication of global rate limiting policies.

Installation:
OpenSuSe 11.0 - Here
Fedora: yum install trickle

Example trickle:

trickle -u 10 -d 20 konqueror

Launch konqueror limiting its upload (-u) capacity to 10 KB/s, and download (-d) capacity at 20 KB/s.

Example trickled:

trickled -u 10 -d 20

Limit aggregate trickle upload bandwidth consumption to 10 KB/s and download consumption to 20 KB/s.

trickled is a userspace bandwidth manager daemon.
trickled manages several trickle sessions at a time, shaping across multiple sessions.

source:http://linuxpoison.blogspot.com/2009/08/135781757116422.html

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