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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.

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

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.

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/.

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

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

tutorial - Windows COM Ports equivalent in Linux

Devices	Windows Com Port	Linux equivalent
Mouse	COM 1	/dev/ttyS0
External Modem	COM 2	/dev/ttyS1
Floppy Drive	Normal Floppy cable	/dev/fd0
Printer	Lpt Port	/dev/lp0
CDROM Drive	IDE cable	/dev/cdrom

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

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

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

tutorial - How to rename all files in directory at once

wget -c http://easylinux.info/uploads/mvb_1.6.tgz
tar zxvf mvb_1.6.tgz -C /usr/share/
chown -R root:root /usr/share/mvb_1.6/
ln -fs /usr/share/mvb_1.6/mvb /usr/bin/mvb

To rename all files in directory at once

mvb NEW_NAME

source:http://linuxpoison.blogspot.com/2008/06/1357817580492.html

tutorial - How to add multiple IP addresses manually?

There are cases where one has to bind multiple ip address to same ethernet card, here are some steps to add them into your network configuration.

# ifconfig

will output all the configured addresses. For example:

eth0: inet addr:10.10.10.10 Bcast:10.10.10.255 Mask:255.255.255.0
...... and more information.

To add on extra IP addresses type:

# ifconfig eth0:1 11.11.11.12 netmask 255.255.255.0

for additional IP addresses, make sure you increment the 1 in eth0:1, for example, a third IP address (third one including your BASE IP) would be added:

# ifconfig eth0:2 11.11.11.13 netmask 255.255.255.0

Hope it helps anyone struggling!

source:http://linuxpoison.blogspot.com/2008/06/135781758016535.html

tutorial - HowTo Create a Driver Diskette from an Image File

To create a driver diskette from a driver diskette image:

Insert a blank, formatted diskette into the first diskette drive.
From the same directory containing the driver diskette image, such as drvnet.img, type
dd if=drvnet.img of=/dev/fd0 as root.

Wait for sometime before system writes the diriver files into the diskette.

source:http://linuxpoison.blogspot.com/2008/06/13578175807796.html

tutorial - How to protect your server from DDos Attack

What is DDos attack:
On the Internet, a distributed denial-of-service (DDoS) attack is one in which a multitude of compromised systems attack a single target, thereby causing denial of service for users of the targeted system. The flood of incoming messages to the target system essentially forces it to shut down, thereby denying service to the system to legitimate users.

There is a perl script which prevent this:
First do the Installation of a simple perl script:
wget http://www.inetbase.com/scripts/ddos/install.sh
chmod 0700 install.sh
./install.sh

Uninstalling:
wget http://www.inetbase.com/scripts/ddos/uninstall.ddos
chmod 0700 uninstall.ddos
./uninstall.ddos

When you run this Perl script, it will then run an netstat command check how many times each IP is connected and if there are more then the number of connections you specified then it will automatically run a command in APF for the IP to be banned.

source:http://linuxpoison.blogspot.com/2008/06/135781758018789.html

tutorial - Firefox vs. Safari vs. IE vs. Opera

The top browsers face off in a battle royal...

Web 2.0 applications and sites place the focus firmly on browser performance. Anyone who still believes that the speed of your DSL connection is the only potential bottleneck is gravely mistaken. Key parts of Ajax applications run locally, which means that — all other things being equal — the speed of the browser will be crucial in determining the user experience. For Ajax-based business applications, the browser becomes even more important because data will be accessed from within-firewall servers rather than the internet. Companies deploying such solutions will be able to improve employee productivity by paying attention to browser performance.

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source:http://linuxpoison.blogspot.com/2008/06/135781758014577.html

tutorial - Ubuntu 8.04 vs. Fedora 9

They do declare a winner in the end, sort of...

...in the past three years, a few distributions have made stupendous leaps in performance and usability, winning the affection of millions of mainstream desktop users.

The recent releases of Ubuntu 8.04 and Fedora 9 — two top Linux distributions — mark another step forward in the evolution of the Linux desktop. I've been running both of them to see which offers the better blend of usability and advanced features.

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source:http://linuxpoison.blogspot.com/2008/06/135781758010493.html

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