Percona is a drop-in replacement for MySQL server, it comes with built-in improved performance that will make your server fly a bit faster (or perhaps a lot!).

Before using the repository, you should add the key to apt

$ gpg --keyserver  hkp://keys.gnupg.net --recv-keys 1C4CBDCDCD2EFD2A
... [some output removed] ...
gpg:               imported: 1

$ gpg -a --export CD2EFD2A | sudo apt-key add -

Add Percona repository

deb http://repo.percona.com/apt squeeze main
deb-src http://repo.percona.com/apt squeeze main

Remember to update the local cache

$ apt-get update

After that you can install the server and client packages

# apt-get install percona-server-server-5.5 percona-server-client-5.5

Sahi is an alternative to Selenium(http://seleniumhq.org/) for web automation. But none of them support real mouse hover (a.k.a CSS hover), but thanks to the powerful XTEST library and xdotool, a command line tool that emulates fake keyboard and mouse, the missing feature can be implemented.

Following an example:

class ClientContext extends BehatContext implements MinkAwareInterface
{

   ...

    /**
     * @Then /^I should see a color change for menu "([^"]*)"$/
     */
    public function iShouldSeeAColorChangeForMenu($menuName)
    {
        /** @var $session \Behat\Mink\Session */
        $session = $this->mink->getSession();

        /** @var $page \Behat\Mink\Element\DocumentElement() */
        $page = $session->getPage();
        $links = $page->findAll('css', 'ul.nice-menu li a');

        /** @var $link \Behat\Mink\Element\NodeElement */
        foreach ($links as $link) {
            if ($link->getText() == $menuName) {
                $jquery = <<< EOF
(jQuery("ul.nice-menu li a:first").offset().top)
EOF;
                $top = $session->evaluateScript($jquery) + 130;
                $jquery = <<< EOF
(jQuery("ul.nice-menu li a:first").offset().left)
EOF;
                $left = $session->evaluateScript($jquery) + 100;
                system('xdotool mousemove ' . $left . ' ' . $top);
                $session->wait(1000);
                $jquery = <<< EOF
(-1 !== jQuery("ul.nice-menu li a:first").css('color').search('255'))
EOF;
                assertSame($session->evaluateScript($jquery), 'true');
            }
        }
    }
}

Image Magick is an awesome tool that also does a great work compressing PDF files.

Just run the following command:

$ convert -compress jpeg -density 150 file.pdf file-compressed.pdf

Notice that -compress is the compression type, and -density is the image quality. Also, JPEG compression is lossy, and reduction of DPI usually is lossy. But I managed to have good compression quality with these settings.

There are more details in the Image Magick manual.

Blessings!

1. Install dependencies

# apt-get install php5-dev

2. Download xhprof source

$ cd /tmp
$ git clone git://github.com/facebook/xhprof.git

3. Install xhprof PHP extension

$ cd xhprof/extension
$ phpize
$ ./configure
$ make
# make install
# echo "extension=xhprof.so" > /etc/php5/conf.d/xhprof.ini
# echo "xhprof.output_dir=/tmp" >> /etc/php5/conf.d/xhprof.ini
# service apache2 restart

4. Install XHProf module in Drupal

a. Install in Drupal 6.x
# cp -a /tmp/xhprof/xhprof_* /var/www/
$ cd myproject

UPDATE 2011-07-19: Following instructions also work with Ubuntu 11.04 Natty Narwhal.

Programming for mobile in Linux was a pain in the neck 6 years ago and it is still a pain in 2011. The following articles may help you in your journey:

1. http://dalibornasevic.com/posts/14-how-to-install-titanium-and-android-s...
2. http://developer.appcelerator.com/question/118186/kitchen-sink-not-worki...
3. http://developer.appcelerator.com/question/35751/error-failed-installing...

If you survive let me know :)

Install basement

$ sudo apt-get install apache2-mpm-worker liblua5.1-0-dev
$ sudo apt-get install libfcgi-dev libapache2-mod-fcgid

Install Luarocks

Download latest version from: http://luarocks.org/releases/, extract it, open a terminal and do a "cd" into its directory, then:

$ ./configure --with-lua-include=/usr/include/lua5.1/
$ make
$ sudo make install

Install WSAPI

$ sudo luarocks install wsapi-fcgi

Configure Apache

If you are an screencaster, for sure you know that there are not much options to grab your desktop + microphone at the same time. Perhaps you have tried some java programs, or simply switched back to windows and used a virtual machine. Too complicated!

Hopefully, there is still an opportunity: recordmydesktop+jack. I will not describe how to install jack here, sorry, google is your friend :)
But once you have jack up & running, do the following:

Download sources
$ apt-get source recordmydesktop

Install development dependencies
$ sudo apt-get build-dep

One month ago I was experiencing memory leaks with Firefox.
I did a fast check with "top" command and seen that when Firefox was running it started to overcharge Xorg, making it to use more and more CPU and Memory resources, near 95%!!!!!!!!
So I've decided to use Opera. That was a nice experience to use that super-fast browser. The problem is that Firefox is a key tool for my working day (I'm web developer).
Today I've launched Opera from the command line, and noticed this warning:
"opera: X Shared memory extension is not available. ZPixmap not supported"

It is one of my first posts in english(recovered from: http://www.linuxforum.com/forums/index.php/topic,137025.0.html): I don't know if it is new, but today, alfer a large week of intensive research, finally i had discover a way to access visual foxpro databases directly from linux. What do you need? download, compile and install CLIP from http://sourceforge.net/projects/clip-itk/ then put the vfp table into the same directory of the next script:

file: testdbf.prg

use dbftable
list columnname

Today I decided to upgrade my debian(leny) box. The process was a classic/easy:

# apt-get dist-upgrade

Then I restarted my computer and Oh! my God!!! there seems to be something diferent, my hearth speed up and then I decided to test compiz-fusion.... Great! this is finally working!!!

Please forgive me, I've forget to explain that I use a relative old HP laptop: Compaq nx9030, that comes with i915 compatible Intel Graphics chipset:

# lspci