Comment spam is the most annoying thing to web operators. Besides eating up bandwidth, comment spam can pollute web discussions area and which gives bad impression to visitors.
Apache HTTPD mod_security module can be configured to reduce web spam by filtering common keyword, content and referrer used by spam bots around the internet.
Here’s an example of .htaccess file to block common comment spam :
<IfModule mod_security.c>
SecFilterEngine On
SecFilterScanPOST On
SecFilterDefaultAction "deny,nolog,auditlog,status:503"
SecFilterSelective POST_PAYLOAD "(mortgage|viagra|poker|traffic|discount|medical|casino|lyrics|loan)"
</IfModule>
Please ensure that your Apache installation has mod_security module enabled. The method is suitable to be used on websites that receive a lot of user comments like forums, blogs (including WordPress and Drupal) and photo gallery.
Note: This is not a full-proof solution as it depends on the use of keywords.
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 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
Glype is a web-based proxy script written in PHP which allows user to browse the internet anonymously using a web-based user-interface. Website operator can easily setup web-proxy without the need to go through complicated installation procedures.
Among the feature of Glype Proxy Script are:
No Installation – Just upload and done!
Javascript support – Allows website to keep their javascript functionality
Blacklist by IP – Admin can easily block users by IP address range
Virtual browser – allow user to change user-agent and
Server-side caching – Reduces bandwidth and server loads for frequently accessed website
The tutorial video is largely aimed for those who are new to Ubuntu. It covers topic ranging from:
Installation (Dual boot & Slideshow)
Pre-Installed Software (LibreOffice 3.3, Firefox 4, Banshee Media Player, Ubuntu One, Software Centre, Puzzle Games, and a 3D shooter)
Desktop & Unity Features (inc Compiz)
Installing Software (few apps to try)
Conclusion
The video is easy to follow and comprehensive. Moreover, its Youtube page contains Chapter Timing bookmarks, which enables user to skip to appropriate chapter without going through the video serially.
The newly released Ubuntu 11.04 (Natty Narwhal) features Unity shell interface which displays the current user name the top right of the panel (MeMenu) that adds a personalized feeling to desktop users.
However some users might not be comfortable to have their username appears on the computer screen, especially when they are working on a publicly accessible computer or when they do not want their username to appear on screenshots or screen-casts of their desktop.
So to remove the username, one only need to open a console, and run the following command: gconftool -s /system/indicator/me/display –type int 0
Before
After
Alternatively, you can also choose to display your own fullname on MeMenu. You can do that by running the following command: gconftool -s /system/indicator/me/display –type int 2
You return to the default setting of displaying your current username, by running: gconftool -s /system/indicator/me/display –type int 1
