Posts

Posted on

Video: Playing tunes on Google Guitar Doodle

Google has made a playable guitar doodle to commemorate the birthday anniversary of Les Paul, the electric guitar inventor. Although lacking few notes as well as the ability to lengthen the notes– within hours, people have come ups with guitar tabs for for playing popular songs on this doodle.

Among the tabs:
Intro of One – Metallica – DJDG AJAG DJDG AJAGK DJDG SJSG AJAG
Godfather – DHKJH KHJH FGD
Smoke on the Water – SFG SFG HSFG FS
Twinkle-Twinkle little star – AAGGHHG FFDDSSA GGFFDDS GGFFDDS AAGGHHG FFDDSSA
Happy Birthday – AASAFD AASAGF AAKHFDS KKFGF
Yankee Doodle – KKL; – K;L – KKL; – KJ – KKL; – FDSA – JGHJ

Posted on

How to solve Apache – Could not reliably determine the server’s fully qualified name – error in Ubuntu

Apache2 web server will almost always display this information message :
"Could not reliably determine the server's fully qualified name"
when it is first started in Ubuntu and Debian server.

The reason behind this message is because the web server fails to find the suitable domain name in the system.

How to remove the message
First, you need to edit “/etc/hosts” file and put your server name of choice in the file. For example:

127.0.0.1 server.mylocal

Then you need to add “ServerName” directive in the “/etc/apache2/apache2.conf” file.

ServerName server.mylocal

Finally, restart the web server for the changes to take effect. You will notice that the information message is gone now.

$ sudo service apache2 restart

Posted on

How to mine Bitcoin in Ubuntu using OpenCL and Bitcoinminer.py

Bitcoin is a form of decentralize digital currency, so unlike other digital currency services (like e-gold), bitcoin is not susceptible to be frozen, seized or invalidated. Bitcoin can be transfered transfered directly from person to person directly without intermediaries.

Bitcoin are generated over the internet by application called bitcoin miners using a set of algorithm to ensure that the number of generated bitcoin is within predictable and limited range. Though with the numbers of bitcoin in circulation today means that it would require significant processing power to generate bitcoins, it doesn’t stop anybody who are willing to try and mine them.

For a brief introduction to Bitcoin, please watch :

Bitcoin Miner on Ubuntu ?
Enter OpenCL and Bitcoinminer.py which allows bitcoin to be mined using a much more efficient GPU power (certain models of Nvidia and ATI graphic cards only, with appropriate drivers).

Step 1: To install the miner, you need to “install python-pyopencl subversion.

Step 2: Then you need to use subversion to obtain python-jsonrpc, by running:

svn checkout http://svn.json-rpc.org/trunk/python-jsonrpc
cd python-jsonrpc/
sudo python setup.py install

Step 3: Then you need to generate bitcoin.conf file:

cd ..
mkdir .bitcoin
echo "rpcuser=username" > .bitcoin/bitcoin.conf
echo "rpcpassword=password" >> .bitcoin/bitcoin.conf

Step 4: After that, download BitcoinMiner files

wget --no-check-certificate https://github.com/m0mchil/poclbm/raw/master/BitcoinMiner.cl
wget --no-check-certificate https://github.com/m0mchil/poclbm/raw/master/BitcoinMiner.py
wget --no-check-certificate https://github.com/m0mchil/poclbm/raw/master/poclbm.py

Step 5: Download bitcoin server for linux

wget http://iweb.dl.sourceforge.net/project/bitcoin/Bitcoin/bitcoin-0.3.19/bitcoin-0.3.19-linux.tar.gz
tar xvf bitcoin-0.3.19-linux.tar.gz
~/bitcoin-0.3.19/bin/64/bitcoin -server&

Step 6: Then finally, running the miner

python poclbm.py -d 0 --user username --pass password

The parameter -d 0 denotes that the miner will use GPU #1 for its bitcoin mining generation, increment it to -d 1 for GPU #2 and so forth. Change the “password” and “username” parameter from Step 3 and Step 6 appropriately to keep people from reaping the fruits (read: steal bitcoins) of your mining operation.

For more information about mining bitcoins and about Bitcoin in general, please visit : WeUseCoins website

Posted on

Enable Hardware Notification on Ubuntu Desktop when plugging devices – udev-notify

udev-notify enables hardware notification on desktop whenever devices are plugged to the computer. It provides a convenient way for users to get visual feedback on whether the devices has been successfully recognized by the computer or otherwise.

udev-notify is known to be compatible with Debian and Ubuntu (to some extend Fedora 15) under GNOME and XFCE. udev-notify display the type,name and model of the device connected and recognized by the computer on the desktop.

Udev
Udev
Udev
Udev

Installing udev-notify

echo "deb http://download.learnfree.eu/repository/skss / #SKSS" | sudo tee -a /etc/apt/sources.list
wget http://download.learnfree.eu/repository/skss/repo.pub.asc -q -O- | sudo apt-key add -
sudo apt-get update
sudo apt-get install udev-notify

And you may try plugging in devices to your computer to see if it works!

Posted on

Create Professional Photo Slideshow DVD in Linux with Imagination

Imagination is GTK+ 2 application which enables you to create professional DVD Photo Slideshow. Imagination contains many transition effects that can turn your photo collection into breathtaking multimedia presentation.

Imagination

 

Imagination can output video in various video format and codec supported by FFMPEG including (but not limited to) :
* FLV
* MPEG
* AVI (various codec)
* MKV
* OGG Theora

Imagination is included in Ubuntu repository and can be easily installed using Synaptic or apt-get to install it