tutorial - What is the difference between Ubuntu, Kubuntu, Xubuntu, or Edubuntu?

Ubuntu uses a user interface (or desktop environment) called Gnome. Gnome is focused on simplicity and usability. Ubuntu includes a bunch of Gnome-native applications such as Rhythmbox (music player), Sound Juicer (CD player and ripper), Evolution (email client and calendar), and Gedit (text editor). You can find the full list of software packages in ubuntu-desktop here.

Kubuntu uses the K Desktop Environment (also known as KDE). KDE is focused on including a lot of point-and-click configuration options immediately available to end users. Kubuntu includes a bunch of KDE-native applications such as AmaroK (music player), K3B (CD burning), Konqueror (web browser and file manager), and Kopete (instant messenger). You can find the full list of software packages in kubuntu-desktop here.

Xubuntu uses the Xfce desktop environment, which is a lighter one than Gnome or KDE. In terms of its design principles, it has a bit of a balance—presenting in some ways more point-and-click configuration options than Gnome but also retaining some of the simplicity of Gnome. Its main appeal is its speed, though, and it's ideal for systems with 128 to 256 MB of RAM. Both Ubuntu and Kubuntu can run on 256 MB of RAM, but they're more ideal for 512 MB of RAM or more. Xfce includes Thunar (file manager), Thunderbird (email client), and Mousepad (text editor). You can find a full list of software packages in xubuntu-desktop here.

Edubuntu uses the Gnome desktop environment but has a different set of default applications from Ubuntu. Its focus is on educational tools. It includes GPaint (an easy to use paint program), Atomix (a puzzle game for building molecules out of isolated atoms), and Xaos (a real-time interactive fractal zoomer). You can find a full list of software packages in edubuntu-desktop here.

Gobuntu is a GNU/Linux operating system, derived from Ubuntu, that endeavors to adhere to the Free Software Foundation's four freedoms and intends to provide a base for other free software platforms to build upon with minimal modification required. It does this by only including open-source non-restricted software. This means there will be no firmware, drivers, applications, or content included in Gobuntu that does not include the full source or whose license does not provide the right to use, study, modify, and redistribute the body of work.

Gobuntu shares the same system requirements as Ubuntu. At present, this means Gobuntu is available for 32-bit and 64-Bit PC architectures and the install requires at least 4 GB of disk space. you can get Gobuntu here


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source:http://linuxpoison.blogspot.com/2008/05/135781758014557.html

tutorial - Banshee now with Video Playback support

Banshee is adding video support to its list of features. According to the v1.0 Alpha 2 release notes, his release brings a much sought after feature for Banshee - Video management and integrated playback! Your Video Library supports searching, playlists, smart playlists, queuing, and even bookmarks, just like your Music Library.

The Music and Video libraries are separated in the interface to provide a clean separation of content, so video will never be mixed in with music - when browsing or searching.

If you are running openSUSE 10.3 there is a 1-Click Install available:


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source:http://linuxpoison.blogspot.com/2008/05/13578175804006.html

tutorial - Mythbuntu - MythTV based PVR system


MythTV is a GPL licensed suite of programs that allow you to build the mythical home media convergence box on your own using Open Source software and operating systems. MythTV is known to work on Linux and Mac OS X (PowerPC and Intel). It does not run on Windows.

After long hours and endless work the Mythbuntu team is excited about the release of Mythbuntu 8.04. This release is built on the LTS base of Ubuntu 8.04 Hardy Heron. We would like to thank everyone that contributed in getting to this second release.

Features
* Frontend can be run from the live CD
* Complete installations(Backend, Frontend, Backend/Frontend, etc)
* Xfce4 Linux Desktop Environment
* Easily upgrade from Ubuntu Hardy to Mythbuntu
* Custom Mythbuntu MythTV theme
* GUI setup of LIRC
* Setup MythTV optimizations through MCC
* Diskless Server setup through MCC

Recommended System Requirements:
* 2.0 Ghz x86 or x86_64 Processor*
* 1024 MB of system memory (RAM)
* 10 GB disk space (Frontend Role)
* 80 GB+ disk space (Backend Role)**
* nVidia 128MB Graphics Card w/ TV-Out or equivalent***
* Supported TV Tuner Card (Backend Role)

Download Mythbuntu: here


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source:http://linuxpoison.blogspot.com/2008/05/135781758015230.html

tutorial - DHCP server Configuration in Ubuntu

Installation

At a terminal prompt, enter the following command to install dhcpd:

sudo apt-get install dhcp3-server

You will probably need to change the default configuration by editing /etc/dhcp3/dhcpd.conf to suit your needs and particular configuration.

You also need to edit /etc/default/dhcp3-server to specify the interfaces dhcpd should listen to. By default it listens to eth0.

Most commonly, what you want to do is assign an IP address randomly. This can be done with settings as follows:

# Sample /etc/dhcpd.conf
# (add your comments here)
default-lease-time 600;
max-lease-time 7200;
option subnet-mask 255.255.255.0;
option broadcast-address 192.168.1.255;
option routers 192.168.1.254;
option domain-name-servers 192.168.1.1, 192.168.1.2;
option domain-name "mydomain.example";

subnet 192.168.1.0 netmask 255.255.255.0 {
range 192.168.1.10 192.168.1.100;
range 192.168.1.150 192.168.1.200;
}

This will result in the DHCP server giving a client an IP address from the range 192.168.1.10-192.168.1.100 or 192.168.1.150-192.168.1.200. It will lease an IP address for 600 seconds if the client doesn't ask for a specific time frame. Otherwise the maximum (allowed) lease will be 7200 seconds. The server will also "advise" the client that it should use 255.255.255.0 as its subnet mask, 192.168.1.255 as its broadcast address, 192.168.1.254 as the router/gateway and 192.168.1.1 and 192.168.1.2 as its DNS servers.


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source:http://linuxpoison.blogspot.com/2008/05/135781758014852.html

tutorial - Linux Home Server - Amahi

The Amahi server is a Linux Home Server distribution targeted for home and home office environments.

The focus of the Amahi server is to create a home server with usability, cross-platform compatibility and ease of use in mind.More simply, the Amahi server is about making your home networking simple!

Amahi provides all the things you would want in a home server:

* Calendaring, Wiki
* Shared network storage, Network Backups
* Printer server, Remote access, ... and a few other features!

The Amahi server is Linux-based, which means it's reliable and virus-free. The project aims to be 100% compatible with PCs and Macs. The goal is to make it a joy to install, run, and more so, a joy to use!

For installs:
* Live CD installs, or
* CD-ROM install, or
* Install on an existing Fedora machine

Hardware Requirements
* The machine should be at least Pentium 3 running at 800MHz
* Recommended RAM is 256 or greater, but it can be done with a little as 128MB
* Some disk space (some users like it large, to store their media)
* One network device



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source:http://linuxpoison.blogspot.com/2008/05/13578175809313.html

tutorial - Password protected GRUB in Ubuntu

Ubuntu installs GNU GRUB as its default boot loader, which allows for great flexibility and recovery options. For example, when you install additional kernel images, these are automatically added as available boot options in the grub menu. Also, by default, alternate boot options are available for each kernel entry that may be used for system recovery.

To add a password for use with grub, first you must generate an md5 password hash using the grub-md5-crypt utility: grub-md5-crypt

The command will ask you to enter a password and offer a resulting hash value as shown below:

Password: (enter new password)
Retype password: (repeat password)
$1$s3YiK$M3lxAbqA6JLm2FbDWnClQ0

Add the resulting hash value to the file /etc/grub/menu.lst in the following format:

password --md5 $1$s3YiK$M3lxAbqA6JLm2FbDWnClQ0

To require use of the password for entering single user mode, change the value of the lockalternative variable in the file /boot/grub/menu.lst to true, as shown in the following example.

# lockalternative=true



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source:http://linuxpoison.blogspot.com/2008/05/135781758016235.html

tutorial - ufw (Uncomplicated Firewall) setup and configuration in Ubuntu

The default firewall configuration tool for Ubuntu is ufw. Developed to ease iptables firewall configuration, ufw provides a user friendly way to create an IPv4 or IPv6 host-based firewall.

The following are some examples of how to use ufw:

First, ufw needs to be enabled. From a terminal prompt enter: sudo ufw enable
To open a port (ssh in this example): sudo ufw allow 22
Similarly, to close an opened port: sudo ufw deny 22
To remove a rule, use delete followed by the rule: sudo ufw delete deny 22
ufw can be disabled by: sudo ufw disable

It is also possible to allow access from specific hosts or networks to a port. The following example allows ssh access from host 192.168.0.2 to any ip address on this host:

sudo ufw allow proto tcp from 192.168.0.2 to any port 22


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source:http://linuxpoison.blogspot.com/2008/05/135781758016942.html

tutorial - 20 Awesome Devices That Run Linux (But Weren’t Designed To)

A common attitude among people who believe in free software is to stick it to “the man.” For some people, that translates into spending a ton of free time porting Linux to devices that were never designed for it.

This is one of the things that always amazes me when I read about the latest high-tech devices that been modified to run Linux. Some of these implementations may be incomplete, and I’m not sure why someone would take a brand new device and risk bricking it…

Here’s a short list of devices that make unlikely with Linux. Enjoy!

  1. AppleTV: http://www.mactel-linux.org/wiki/AppleTV
  2. Browser: http://www.workspot.com/screenshots/gimp.html
  3. Gmail: http://www.hackaday.com/2005/04/14/run-linux-on-gmail/
  4. GameCube: http://www.linuxdevcenter.com/pub/a/linux/2004/04/01/warp_pipe.html
  5. Dreamcast: http://www.linuxdevices.com/articles/AT7466555948.html
  6. HTC Smartphones: http://wiki.xda-developers.com/index.php?pagename=Xanadux
  7. iPod: http://ipodlinux.org/Main_Page
  8. Mainframes: http://parisc-linux.org/
  9. Palm PDAs: http://palmtelinux.sourceforge.net/
  10. PS2: http://playstation2-linux.com/
  11. Edit: MSN TV2 http://www.toc2rta.com/index.php/?q=node/2
  12. PSP: http://www.extremetech.com/article2/0,1697,1906893,00.asp
  13. Edit: JuiceBox: http://www.makezine.com/blog/archive/2006/02/run_linux_on_a_juicebox.html
  14. Edit: Mac Classic: http://mac.linux-m68k.org/
  15. Wii: http://www.wiili.org/index.php/Main_Page
  16. Windows: http://wubi-installer.org/
    http://goodbye-microsoft.com/
    http://sourceforge.net/projects/instlux/
  17. Wireless Routers: http://www.dd-wrt.com/wiki/index.php/Installation http://hyperwrt.org/
  18. Xbox: http://www.xbox-scene.com/articles/linux-install.php
  19. Xbox360: http://www.free60.org/wiki/Main_Page

Last but not least, a toaster: http://pics.defcon.org/showphoto.php?photo=53&cat=512

I showed you mine, now you get to show me yours! What would you like to see running Linux?

Edit… PS3, VirtualPC and USB drives were removed.

Here’s another for you all… Your Mom Can Run Linux: http://www.linuxtoday.com/news_story.php3?ltsn=2007-08-03-032-26-OP-DT

[Source: http://www.fsckin.com/]


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source:http://linuxpoison.blogspot.com/2008/05/135781758011671.html

tutorial - Installation and Configuration of MySQL in Ubuntu

To install MySQL, run the following command from a terminal prompt:
sudo apt-get install mysql-server

During the installation process you will be prompted to enter a password for the MySQL root user.

Once the installation is complete, restart the MySQL server: sudo /etc/init.d/mysql restart
Check if MySQL is running: sudo netstat -tap | grep mysql
you should see the following line or something similar:

tcp 0 0 localhost.localdomain:mysql *:* LISTEN -

Configuration

You can edit the /etc/mysql/my.cnf file to configure the basic settings -- log file, port number, etc. For example, to configure MySQL to listen for connections from network hosts, change the bind_address directive to the server's IP address:

bind-address = 192.168.0.5

[Note] Replace 192.168.0.5 with the appropriate address.

After making a change to /etc/mysql/my.cnf the mysql daemon will need to be restarted:

sudo /etc/init.d/mysql restart


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source:http://linuxpoison.blogspot.com/2008/05/13578175801318.html

tutorial - Ubuntu installer for Windows users

Wubi is an officially supported Ubuntu installer for Windows users that can bring you to the Linux world with a single click. Wubi allows you to install and uninstall Ubuntu as any other Windows application, in a simple and safe way. Are you curious about Linux and Ubuntu? Trying them out has never been easier!

Wubi is Simple
No need to burn a CD. Just run the installer, enter a password for the new account, and click "Install", go grab a coffee, and when you are back, Ubuntu will be ready for you.

Wubi is Safe
You keep Windows as it is, Wubi only adds an extra option to boot into Ubuntu. Wubi does not require you to modify the partitions of your PC, or to use a different bootloader, and does not install special drivers. It works just like any other application. Wubi is spyware and malware free, and being open source, anyone can verify that.

Wubi is Discrete
Wubi keeps most of the files in one folder, and if you do not like it, you can simply uninstall it as any other application.

Wubi is Free
Wubi and Ubuntu cost absolutely nothing (free as in beer), but yet provide a state of the art, fully functional, operating system that does not require any activation and does not impose any restriction on its use (free as in freedom).

Download wubi exe: here


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source:http://linuxpoison.blogspot.com/2008/05/135781758017520.html

tutorial - vsftp server installation and configuration in Ubuntu

vsftpd is an FTP daemon available in Ubuntu. It is easy to install, set up, and maintain. To install vsftpd you can run the following command: sudo apt-get install vsftpd

vsftpd - FTP Server Configuration

You can edit the vsftpd configuration file, /etc/vsftpd.conf, to change the default settings. By default only anonymous FTP is allowed. If you wish to disable this option, you should change the following line:

anonymous_enable=YES

to

anonymous_enable=NO

By default, local system users are not allowed to login to FTP server. To change this setting, you should uncomment the following line:

#local_enable=YES

By default, users are allowed to download files from FTP server. They are not allowed to upload files to FTP server. To change this setting, you should uncomment the following line:

#write_enable=YES

Similarly, by default, the anonymous users are not allowed to upload files to FTP server. To change this setting, you should uncomment the following line:

#anon_upload_enable=YES

The configuration file consists of many configuration parameters. The information about each parameter is available in the configuration file. Alternatively, you can refer to the man page, man 5 vsftpd.conf for details of each parameter.

Once you configure vsftpd you can start the daemon. You can run following command to run the vsftpd daemon:

sudo /etc/init.d/vsftpd start


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source:http://linuxpoison.blogspot.com/2008/06/13578175804050.html

tutorial - Tool to find hidden processes and ports

Unhide is a forensic tool to find processes and TCP/UDP ports hidden by rootkits, Linux kernel modules or by other techniques. It includes two utilities: unhide and unhide-tcp.

unhide detects hidden processes using three techniques:
- comparing the output of /proc and /bin/ps
- comparing the information gathered from /bin/ps with the one gathered from system calls (syscall scanning)
- full scan of the process ID space (PIDs bruteforcing)

unhide-tcp identifies TCP/UDP ports that are listening but are not listed in /bin/netstat through brute forcing of all TCP/UDP ports available.

This package can be used by rkhunter in its daily scans.


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source:http://linuxpoison.blogspot.com/2008/06/1357817580639.html

tutorial - Interactive packet manipulation Software - Scapy

Scapy is a powerful interactive packet manipulation program. It is able to forge or decode packets of a wide number of protocols, send them on the wire, capture them, match requests and replies, and much more. It can easily handle most classical tasks like scanning, tracerouting, probing, unit tests, attacks or network discovery (it can replace hping, 85% of nmap, arpspoof, arp-sk, arping, tcpdump, tethereal, p0f, etc.). It also performs very well at a lot of other specific tasks that most other tools can't handle, like sending invalid frames, injecting your own 802.11 frames, combining technics (VLAN hopping+ARP cache poisoning, VOIP decoding on WEP encrypted channel, ...), etc. See the quick demo: an interactive session.

Scapy runs natively on Linux, and on most Unixes with libpcap, libdnet and their respective python wrapper. Scapy needs Python 2.4 or upcomming versions.

Download: Here


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source:http://linuxpoison.blogspot.com/2008/06/135781758017502.html

tutorial - Monitor Web page changes with 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. Better than clicking the refresh button on Caturdays, huh?

Specto is free and open source software distributed under the GNU GPL license.

Download: Here


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source:http://linuxpoison.blogspot.com/2008/06/135781758018076.html

tutorial - Anatomy of Security-Enhanced Linux


Linux has been described as one of the most secure operating systems available, but the National Security Agency (NSA) has taken Linux to the next level with the introduction of Security-Enhanced Linux (SELinux). SELinux takes the existing GNU/Linux operating system and extends it with kernel and user-space modifications to make it bullet-proof. If you're running a 2.6 kernel today, you might be surprised to know that you're using SELinux right now! This article explores the ideas behind SELinux and how it's implemented.

Public networks like the Internet are dangerous places. Anyone who has a computer attached to the Internet (even transiently) understands these dangers. Attackers can exploit insecurities to gain access to a system, to obtain unauthorized access to information, or to repurpose a computer in order to send spam or participate in attacks on other high-profile systems (using SYN floods, as part of a Distributed Denial of Service attacks).

Read more at IBM.com


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source:http://linuxpoison.blogspot.com/2008/06/135781758015091.html

tutorial - An authenticating firewall


NuFW lays on Netfilter, the state of the art IP filtering layer from the Linux kernel. It fully integrates with Netfilter and extends its capabilities. The daemons currently run on Linux and software clients are available for Windows, Linux, FreeBSD et Mac OSX.
Its exclusive algorithm allows authenticated filtering even on multiuser computers.

NuFW can be seen as an Identity access management solution, at the network level.

NuFW can :

* Authenticate any connection that goes through your gateway or only from/to a chosen subset or a specific protocol (iptables is used to select the connections to authenticate).
* Perform accounting, routing and quality of service based on users and not simply on IPs.
* Filter packets with criterium such as application and OS used by distant users.
* Log all traffic in SQL with username and application information
* Be the key of a secure and simple Single Sign On system.

Download: Here


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source:http://linuxpoison.blogspot.com/2008/06/13578175807379.html

tutorial - Protect SSH from brute force attacks

pam_abl provides auto blacklisting of hosts and users responsible for repeated failed authentication attempts. Generally configured so that blacklisted users still see normal login prompts but are guaranteed to fail to authenticate.

Brute force password discovery attacks involve repeated attempts to authenticate against a service using a dictionary of common passwords. While it is desirable to enforce strong passwords for users this is not always possible and in cases where a weak password has been used brute force attacks can be effective.

The pam_abl module monitors failed authentication attempts and automatically blacklists those hosts (and accounts) that are responsible for large numbers of failed attempts. Once a host is blacklisted it is guaranteed to fail authentication even if the correct credentials are provided.

Blacklisting is triggered when the number of failed authentication attempts in a particular period of time exceeds a predefined limit. Hosts which stop attempting to authenticate will, after a period of time, be un-blacklisted.

Download: Here

Installation:

$ make install
$ cp conf/pam_abl.conf /etc/security

Edit your PAM configuration to include the pam_abl.so module. Here's an example

auth required /lib/security/pam_env.so
auth required /lib/security/pam_abl.so config=/etc/security/pam_abl.conf
auth sufficient /lib/security/pam_unix.so likeauth nullok
auth required /lib/security/pam_deny.so



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source:http://linuxpoison.blogspot.com/2008/06/135781758010991.html

tutorial - SmoothWall, the firewall for home users

SmoothWall Express is an open source firewall distribution based on the GNU/Linux operating system. Linux is the ideal choice for security systems; it is well proven, secure, highly configurable and freely available as open source code. SmoothWall includes a hardened subset of the GNU/Linux operating system, so there is no separate OS to install. Designed for ease of use, SmoothWall is configured via a web-based GUI, and requires absolutely no knowledge of Linux to install or use.

SmoothWall Express turns a PC into a dedicated hardware firewall, which sits between your private network and the Internet. It does not allow any unauthorised data to pass through the firewall. There are no services offered to the Internet and SmoothWall Express will not respond to the network messages that hackers use to identify potential targets. It is therefore quite simply invisible to the legions of script kiddies, hackers and crackers looking for an interesting firewall to attack.

Key features

If using analog MODEM, ISDN, USB ADSL, Ethernet connection to the Internet
* network address translation, hide your computer IP address

Stateful packet inspection

* IP address tracking – trace those hackers using the in-build ‘Who is’ feature
* IP address blocking – create your own IP address block list
* Intrusion detection – find out who is ‘probing’ your network
* Comprehensive logging features – all events are logged for evidence
* Monitor network load graphically

No monitor; keyboard or mouse required

* Does not slow down the network or the broadband connection
* Remote access and remote shut down feature

DHCP Server , HTTP Proxy Server
Dynamic DNS
Virtual Private Networking (VPN)
Configuration backup and Secure Shell

Download Smoothwall Express here.


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source:http://linuxpoison.blogspot.com/2008/06/135781758017779.html

tutorial - How much do you really know about the GPL?

So your a developer of free software. Now you want to license your code under the GPL. How much do you really know about the GPL?

Take the Free Software License Quiz and find out how much you know (or don’t know) about the GPL and/or LGPL.

This quiz is a very short cgi written in Perl (source available) that tests basic knowledge about the Definition of Free Software, the GPL and the LGPL.

One may wish to review the GPL FAQ before taking the quiz.

Take the quiz and post your results as a comment. You may be surprised.


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source:http://linuxpoison.blogspot.com/2008/06/135781758018938.html

tutorial - google gadgets for linux


Google Gadgets for Linux provides a platform for running desktop gadgets under Linux, catering to the unique needs of Linux users, this project is open-sourced, under the Apache License.

The Windows and Mac versions of Google Desktop has provided gadget hosting functionality on Windows and Mac for a while now and the Linux version of Google Gadgets will extend this platform to Linux users. By enabling cross-platform gadgets, a large library of existing gadgets are immediately available to Linux users. In addition, gadget developers will benefit from a much larger potential user base without having to learn a new API.

There's two main components to the application: one is a common gadget library responsible for running and presenting a gadget, and the other is a host program that allows the user to choose gadgets and run them on the desktop. Currently they have hosts written for GTK+ and QT, with the GTK+ host offering a sidebar similiar to that of Google Desktop for Windows.

Download: Here


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source:http://linuxpoison.blogspot.com/2008/06/13578175807518.html

tutorial - Convert your videos quickly, easily, and all at once with WinFF and FFmpeg


WinFF is a GUI for the command line video converter, FFMPEG. It will convert most any video file that FFmpeg will convert. WinFF does multiple files in multiple formats at one time. You can for example convert mpeg's, flv's, and mov's, all into avi's all at once. WinFF is available for Windows 95, 98 , ME, NT, XP, VISTA, and Debian, Ubuntu, Redhat based GNU/Linux distributions.




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source:http://linuxpoison.blogspot.com/2008/06/13578175804909.html

tutorial - Install PHP5 on Ubuntu


PHP is a general-purpose scripting language suited for Web development. The PHP script can be embedded into HTML. This section explains how to install and configure PHP5 in Ubuntu System


Installation


To install PHP5 you can enter the following command in the terminal prompt:

sudo apt-get install php5 libapache2-mod-php5

You can run PHP5 scripts from command line. To run PHP5 scripts from command line you should install php5-cli package. To install php5-cli you can enter the following command in the terminal prompt:

sudo apt-get install php5-cli

You can also execute PHP5 scripts without installing PHP5 Apache module. To accomplish this, you should install php5-cgi package. You can run the following command in a terminal prompt to install php5-cgi package:

sudo apt-get install php5-cgi

To use MySQL with PHP5 you should install php5-mysql package. To install php5-mysql you can enter the following command in the terminal prompt:

sudo apt-get install php5-mysql


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source:http://linuxpoison.blogspot.com/2008/06/135781758017261.html

tutorial - Checking your CDs with cdck

We all know that CDs don't live forever. Often loss of data is predictable when the disc is starts to take longer to read, but these changes in speed are often enough too small to be noticed or something else (like the overall system load) is taken responsible for it.

Therefor it is good to have a little tool that analyzes your discs properly so that you can make a backup in time. Such a tool is cdck. It's just a small command-line program, but as many Unix-tools it is a specialized tool which does it's job right.

It reads the disc block by block and measures the time it takes to read each block. Based on these statistics you get a summary about the current quality of your CD or DVD. If you like you can even output a graph which can then be displayed in GNUPlot.


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source:http://linuxpoison.blogspot.com/2008/06/13578175803709.html

tutorial - Sending email attachments from linux command line

Many times we required to send mail attachments from command line, when administering a server remotely. The procedure is simple using mutt that is available in all Unix flavors and Windows Microsoft.

$ mutt -s "Logs" -a http_access.log nikesh@domain.com

Or Without subject:

$ echo | mutt -a [file] [mail@address.com]

Mutt website: http://www.mutt.org/.


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source:http://linuxpoison.blogspot.com/2008/06/13578175806681.html

tutorial - Disable users from loggin into the server, except the administrator

In cases where you have to disable the login to all users,except root, for example when you have to do a backup, you have to use pam_nologin.so (man nologin).

1) Edit the pam file for the service you want to control, in this example i modify ssh pam control file, located in /etc/pam.d/sshd

Add this line
account required pam_nologin.so

2) Create the /etc/nologin file, just do "touch /etc/nologin"

This should disable the login from ssh. If you want to disable the login from terminal, modify the /etc/pam.d/login file.

3) To re-enable the login just remove /etc/nologin


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source:http://linuxpoison.blogspot.com/2008/06/135781758012382.html

tutorial - Windows COM Ports equivalent in Linux


DevicesWindows Com PortLinux equivalent
MouseCOM 1/dev/ttyS0
External ModemCOM 2/dev/ttyS1
Floppy DriveNormal Floppy cable/dev/fd0
PrinterLpt Port/dev/lp0
CDROM DriveIDE cable/dev/cdrom

What does this mean is, Com 1 in Windows is /dev/ttyS0 in Linux everywhere


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source:http://linuxpoison.blogspot.com/2008/06/135781758013670.html

tutorial - How to quickly bind a range of IPs on RedHat based systems

In this short post I will show you how you can quickly add a range of IPs on any RedHat based system (Rhel, Centos, Fedora, etc). When you have to add many IPs to a system this can be quite handy and save a lot of time.

Normally when you add a new IP to a network interface in a RedHat based system you create a file ifcfg-eth0:x in /etc/sysconfig/network-scripts/. For example:
/etc/sysconfig/network-scripts/ifcfg-eth0:0
DEVICE=eth0:0
ONBOOT=yes
BOOTPROTO=static
IPADDR=192.168.0.100
NETMASK=255.255.255.0
NETWORK=192.168.0.0
BROADCAST=192.168.0.255
TYPE=Ethernet

Similar to the above example you can create several aliases. But what if you have to add a lot of IPs that are in a range like this? Let’s say that I want to add 100 IPs this way… this is possible, but not very effective, right? RedHat based systems offer a method to bind a range of IPs in a quick way allowing us to eliminate the need to create a lot of files and saving us time doing this.
Create a file /etc/sysconfig/network-scripts/ifcfg-eth0-range0 if this doesn’t exist, or just add to it if you already have it, the following lines:

/etc/sysconfig/network-scripts/ifcfg-eth0-range0
IPADDR_START=192.168.0.100
IPADDR_END=192.168.0.200
CLONENUM_START=0

where: IPADDR_START is the first IP and IPADDR_END is the last IP in the range. CLONENUM_START is the number that will be assigned to the first IP alias interface (eth0:0 in this example).

If you need to add more ranges of IPs then just use a different file for ex. ifcfg-eth0-range1, for each one of the ranges. You need to be careful and use the proper CLONENUM_START to not overwrite other aliases. Once you have configured the range/s of IPs you just need to restart the network service in order to activate it:

service network restart


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source:http://linuxpoison.blogspot.com/2008/06/13578175801007.html