Tutorial Proggraming Free

tutorial - QuickStart - IMAP/POP server configuration on OpenSuSe

Dovecot is an IMAP server whose major goals are security and extreme reliability. It uses index files to optimally store the mailbox state, which makes it very fast even with huge mailboxes. Indexes won't prevent external mailbox updates, so Dovecot is still fully compatible with standard Maildir and mbox formats. There's also a fully featured POP3 server included.

Installation: Use "1-click" installer to install dovecot
OpenSuse 11.1 - here
OpenSuse 11.0 - here

Configuration:
To configure dovecot, you edit the file /etc/dovecot/dovecot.conf.

IMAP and POP3. POP3 is useful when e-mail is checked from only one computer, and is best for people who download their email, and then work offline. IMAP is the better choice when you would like to check your mail from multiple computers, at work and home, for example. IMAP has the added benefit of accessing folders on the server, allowing you to organize your e-mail, and access it from anywhere.

IMAPS and POP3S are more secure than the simple IMAP and POP3 because they use TLS encryption to connect.

Once you have chosen, amend the following line in the file /etc/dovecot/dovecot.conf:

protocols = pop3 pop3s imap imaps

This enables those protocols when dovecot is started.

Start dovecot: /etc/init.d/dovecot start

To check that it is running, type the command ps -A|grep dovecot. You should see the dovecot service running. If you have enabled imap, or pop3, you can also try to log in with the commands telnet localhost pop3 or telnet localhost imap. If you see something like the following, the installation has been successful.

poison:# telnet localhost imap
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
* OK Dovecot ready.

This is a very simple configuration of dovecot, check the site to know more about some detail configuration.

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source:http://linuxpoison.blogspot.com/2009/04/13578175717614.html

tutorial - How To search for an string in a file using grep

grep searches the input files for lines containing a match to a given pattern list. When it finds a match in a line, it copies the line to standard output (by default), or does whatever other sort of output you have requested with options.

grep can simply be invoked: $ grep 'STRING' filename

This is OK but it does not show the true power of grep. First this only looks at one file. A cool example of using grep with multiple file would be to find all files in a directory that contains the name of a person. This can be easily accomplished using a grep in the following way :

$ grep 'Nikesh J' *

Notice the use of single quotes; This are not essential but in this example it was required since the name contains a space. Double quotes could also have been used in this example.

Grep Regular Expression

grep can search for complicated pattern to find what you need. Here is a list of some of the special characters used to create a regular expression:

`.' The period `.' matches any single character.

`?' The preceding item is optional and will be matched at most once.

`*' The preceding item will be matched zero or more times.

`+' The preceding item will be matched one or more times.

So an example of a regular expression search would be: $ grep "\<[A-Za-z].*" file

This will search for any word which begins with a letter upper or lower case.

For more details check: $ man grep

source:http://linuxpoison.blogspot.com/2009/04/135781757116538.html

tutorial - Removing Internet Junks (ads, banners, pop-ups, etc ..) using privoxy on OpenSuSe

Privoxy is a Web proxy based on Internet Junkbuster with advanced filtering capabilities for protecting privacy, filtering Web page content, managing cookies, controlling access, and removing ads, banners, pop-ups, and other obnoxious Internet junk. Privoxy has a very flexible configuration and can be customized to suit individual needs and tastes. Privoxy is useful for both stand-alone systems and multi-user networks.

Installation: use "1-click" installer to install Privoxy
OpenSuSe 11.1 - here
OpenSuSe 11.0 - here

Having installed privoxy, we need to edit the config file and make some small changes. To edit, run: vi /etc/privoxy/config

You can choose to read the ToC and the Introduction (and of course the descriptions of each option), but if you want to skip that and get to a working proxy, search for the word "listen-address" in the cofig file and set your local ip address and port on which privoxy server will listen.

listen-address 192.168.0.1:8118

(Your ip will most likely be different). This is the IP address of the ethernet port the computer is running on. This can also be loopback (127.0.0.1) if you dont want to share your advert freeing proxy goodness :). The other part (after the ":") is the port number to listen on - this can be almost anything, but unless you need it moved, its probably best to leave it where it is.

Thats our big change here! save and exit the editor your using, then restart the daemon, and your finished: # /etc/init.d/privoxy restart

You should now have a filtering proxy running on the IP and port you just specified. If you want Firefox or some other browser to run through it, you simply change the settings in the browsers configuration.

Firefox:
Open the browser, click Edit -> Preferences. Click the 'connection settings' button, and click on 'manual proxy configuration'. In the top field add the following (as shown in the figure)

You can also go to http://config.privoxy.org/show-status to check the status of you priovoxy server and other configuration details

source:http://linuxpoison.blogspot.com/2009/04/13578175719797.html

tutorial - Creating backup/restore images using dd

Create a hard disk image: dd if=/dev/hda1 of=/home/hda1.bin

Create a compressed disk image: dd if=/dev/hda1 | gzip > /home/hda1.bin.gz

Back up the MBR: dd if=/dev/hda of=/home/hda.boot.mbr bs=512 count=1

Restore MBR (from a Live CD): dd if=/mnt/hda1/home/hda.boot.mbr of=/dev/hda bs=512 count=1

Backup a drive to another drive: dd if=/dev/hda of=/dev/hdb conv=noerror,sync bs=4k

The command:

dd -if /dev/hda1 > partitionimage.dd

will backup "/dev/hda1" partition. A whole drive (including the MBR) could be backed up using just /dev/hda as the input "file". Restoring is done by: dd -if partitionimage.dd -of /dev/hda1

If you have a complete new harddrive and want to restore the backup (or copy your old system to the new drive). First, the new drive has to be bigger or exactly the same size as the old one. First go superuser and switch to runlevel 1 so that you can fumble around with the harddisk without other services interfering

restore either the whole disk to the new drive or one partition (depending on how you made the backup): dd -if partitionimage.dd -of /dev/hda1

If you restored the whole drive (/dev/hda), the system will not automatically create the devices (/dev/hda1, /dev/hda2) if you just restored the whole drive. If you know how to make the devices show up without reboot, write it here, otherwise this is a good moment to reboot.

If you restored the system to a new drive, and your device names changed (for example from /dev/hda to /dev/sda) then you must adapt the bootloader and the mount points. While still on runlevel 1, edit these files:

/boot/grub/menu.list
/etc/fstab

After your system is able to boot and runs again, you can resize your partitions to fill the rest of the new harddisk (if you want that) as described here

source:http://linuxpoison.blogspot.com/2009/04/13578175711451.html

tutorial - Installation/Configuration of FUSE FileSystem (sshfs)

Filesystem in Userspace is a simple interface for userspace programs to export a virtual filesystem to the Linux kernel. It also aims to provide a secure method for non privileged users to create and mount their own filesystem implementations.

With FUSE it is possible to implement a fully functional filesystem in a userspace program.

Features include:
    * Simple library API
    * Simple installation (no need to patch or recompile the kernel)
    * Secure implementation
    * Userspace - kernel interface is very efficient
    * Usable by non privileged users
    * Runs on Linux kernels 2.4.X and 2.6.X
    * Has proven very stable over time

Installation: FUSE
1. Download the latest stable FUSE tarball from the SourceForge.net
2. Unpack the archive: tar -zxvf fuse-2.7.4.tar.gz
3. configure FUSE for compilation: ./configure –disable-kernel-module --prefix=/usr
4. Compile FUSE: make
5. If the compilation completes successfully, enter make install to complete the installation of FUSE

Installation sshfs-fuse
1. Download the latest stable sshfs-fuse tarball from SourceForge.net
2. Unpack the archive: tar -zxvf sshfs-fuse-2.2.tar.gz
3. Configure sshfs-fuse for compilation: ./configure --prefix=/usr
4. Compile sshfs-fuse: make
5. If the compilation completes successfully, enter make install to complete the installation of sshfs-fuse

Mount a FUSE Filesystem
Enter sshfs username@server:/directory /mountpoint to use FUSE to mount a directory on a remote server.

Note, that it's recommended to run it as user, not as root. For this to work the mountpoint must be owned by the user. If the username is different on the host you are connecting to, then use the "username@host:" form. If you need to enter a password sshfs will ask for it (actually it just runs ssh which ask for the password if needed). You can also specify a directory after the ":". The default is the home directory.

source:http://linuxpoison.blogspot.com/2009/04/13578175714003.html

tutorial - Installing Google Earth on Ubuntu

1. Download Google Earth from the Google Earth website.
The linux version will be automatically chosen when downloading from Ubuntu.

2. Open a terminal from Applications -> Accessories -> Terminal.
cd into the directory where you saved Google Earth.
For example, if you saved it to the Desktop type: cd ~/Desktop

3.Make it executable by typing:chmod +x GoogleEarthLinux.bin

4.Run the installer by typing:sudo ./GoogleEarthLinux.bin

5. Run Google Earth by selecting Applications -> Internet -> Google Earth.

source:http://linuxpoison.blogspot.com/2009/04/13578175711706.html

tutorial - Linux distribution for children

Nowadays kids are getting more and more familiar with computers. That takes place through games, movies, pictures and all kind of educational programs. And now, there is a new solution for you to give your kids the possibility to use a computer in a fun way.

Qimo4Kids.com is a website that was specially developed in order to provide users with all the information they need about a new operative system for kids. This system was created as a version of Linux for kids.

One of the best things about this new solution is the fact that it comes complete with educational games for children aged 3 and up. This is going to be a very good opportunity for your kids to learn and have fun at the same time.

This site is simple as well as agile to navigate through. There is a section with an archive where you will find more information about the latest news as well as the most important past developments.

In case you want to learn more, just take a look at the site and inform yourself about an operating system of its own that your kids are certain to appreciate.

source:http://linuxpoison.blogspot.com/2009/04/135781757114370.html

tutorial - Ubuntu Extra Remix

Ubuntu extras remix is a Linux distribution based on the latest stable release of Ubuntu and contains restricted extras (Flash player, Java, multimedia codecs, additional fonts, unrar) and official updates.

Here are some key features of "Ubuntu extras remix":

· Adobe Flash
· Java
· Ability to play movie DVDs (codecs + CSS decrypter)
· Multimedia codecs (including MP3)
· Additional fonts
· unrar
· Updates: more than 281 updates (for the Linux kernel, Firefox, OpenOffice.org, evolution, f-spot, gedit, nautilus, network-manager, pulseaudio, totem, rythmbox, transmission, brasero, GIMP, etc, etc...)
· Created with reconstructor

Download
* HTTP (direct link): http://superubuntu.linuxfreedom.com/
* Torrent: http://www.mininova.org/tor/2464065/

source:http://linuxpoison.blogspot.com/2009/04/13578175718631.html

tutorial - Multimedia Support in Ubuntu 9.04 Jaunty Jackalope

Latest free Ubuntu Linux operating system version is officially released today. Ubuntu 9.04 for desktop, server and “netbook remix” is available for immediate download, CD purchase or you can request a free CD.

Ubuntu is a free operating system that can be used on desktop PCs, notebooks, work/business PCs as well as other devices that support either the x86 CPU or ARM CPUs (beginning with version 9.04, previous versions only supported x86). It is a version of Linux that includes a graphical desktop.

Often the case (and especially) when it comes out a new version of Ubuntu, that repositories from which we tend to download software are highly saturated. If you want to download and install the software more quickly, we will have to modify the list of repositories.

There is an option to Synaptic, which allows us to select a server closest to our region. To change this to a server closest go to System> Administration> Origins of software under the tab "Software Ubuntu", choose "download".

Install the software basics of compilation
If you want to compile some of the package that only have the source code, in this case we need to install packages basic Basic compilation:

    sudo aptitude install build-essential

Installing the extra restrictive.
There are certain packages that do not come by default in Ubuntu for legal issues. for example, may be the plug-in flash, or codecs to be able to play some video formats. There is a metapackage (a package that includes many more packages and installs) called ubuntu-restricted-extras that can install all the required restricted packages.

    sudo apt-get install ubuntu-restricted-extras

Repository for mediubuntu Jaunty Jackalope
Mediubuntu is a repository where we can find some applications and codecs that are not installed by default. We can add to the list of repositories from command terminal:

sudo wget http://www.medibuntu.org/sources.list.d/jaunty.list -O /etc/apt/sources.list.d/medibuntu.list

and then

sudo apt-get update && sudo apt-get install medibuntu-keyring && sudo apt-get update

Multimedia Codecs
    sudo apt-get install libdvdread3
    For i386 -- sudo apt-get install w32codecs
    For amd64 -- sudo apt-get install w64codecs
    For ppc -- sudo apt-get install-ppc codecs

Install VLC, Smplayer and Mplayer with all codecs and DVD support
    sudo apt-get install vlc
    sudo apt-get install smplayer
    sudo apt-get install mplayer

Install Flash Player Plugin
    sudo apt-get install flashplugin-nonfree libflashsupport
    sudo apt-get install mozilla-plugin-gnash

source:http://linuxpoison.blogspot.com/2009/04/135781757119415.html

tutorial - Linux MultiMedia Studio - LMMS

LMMS is a free cross-platform alternative to commercial programs like FL Studio®, which allow you to produce music with your computer. This includes the creation of melodies and beats, the synthesis and mixing of sounds, and arranging of samples. You can have fun with your MIDI-keyboard and much more; all in a user-friendly and modern interface.

Features
    * Song-Editor for composing songs
    * A Beat+Bassline-Editor for creating beats and basslines
    * An easy-to-use Piano-Roll for editing patterns and melodies
    * An FX mixer with 64 FX channels and arbitrary number of effects allow unlimited mixing possibilities
    * Many powerful instrument and effect-plugins out of the box
    * Full user-defined track-based automation and computer-controlled automation sources
    * Compatible with many standards such as SoundFont2, VST(i), LADSPA, GUS Patches, and full MIDI support
    * Import of MIDI and FLP (Fruityloops® Project) files

Download:
The following binary-packages are currently available:

    * Windows 2000/XP/Vista - here
    * Ubuntu 8.10 - here
    * openSUSE 11.1 and 11.0 - here

source:http://linuxpoison.blogspot.com/2009/04/1357817571429.html

tutorial - List of Repositories for Ubuntu 9.04 Jaunty Jackalope

source:http://linuxpoison.blogspot.com/2009/04/13578175717178.html

tutorial - Voice Control your Ubuntu desktop

Gnome-Voice-Control is a dialogue system to control the GNOME Desktop. It is developed on Google Summer of Code 2007.

The idea is to develop some features that will improve the usability in the Gnome Desktop (Ubuntu). The goal is to implement a Desktop Voice Control System. The system consists in an application that will be monitoring the audio input(microphone) and when a significant audio signal has been detected, the software catches, processes and recognizes the signal and then executes the desired action over the Gnome Desktop. In a set of actions could include maximize, minimize, close the active window; open a specific program; switching from one desktop to another; among others. GnomeVoiceControl is implemented in C in conjunction with CMU Sphinx, which is an open source tool, created to convert speech to text.

If you'd like to have a quick start, look at screencast below .

Install it from the terminal:

sudo aptitude install gnome-voice-control

The installation and configuration is simple. To use you have to right click on a panel (the bar on the desktop) and add the applet "VoiceControl", and using this applet you can start and stop the use of voice control application.

For now the application is in its initial stage but can do everything like ...

Next Window
Minimize Window
Maximize Window
Close Window

Run Terminal
Run Text Editor
Run Mail

source:http://linuxpoison.blogspot.com/2009/04/135781757117029.html

tutorial - React Operating System - Another Windows in making

ReactOS is a free, modern operating system based on the design of Windows XP/2003. Written completely from scratch, it aims to follow the Windows architecture designed by Microsoft from the hardware level right through to the application level. This is not a Linux based system, and shares none of the unix architecture.

The main goal of the ReactOS project is to provide an operating system which is binary compatible with Windows. This will allow your Windows applications and drivers to run as they would on your Windows system. Additionally, the look and feel of the Windows operating system is used, such that people accustomed to the familiar user interface of Windows would find using ReactOS straightforward. The ultimate goal of ReactOS is to allow you to remove Windows out of your window and install ReactOS without the end user noticing the change.

ReactOS is licensed under the GNU General Public License.

More such screenshots - here

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