As root execute:

apt-get update
apt-get install build-essential ruby rails rubygems1.8
apt-get install ruby1.8-dev libopenssl-ruby

Chance PATH at /etc/environment:

PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/var/lib/gems/1.8/bin"

Update your current environment:

source /etc/environment

Install the Heroku gem:

sudo gem install heroku

Run Heroku authentication configuration:

heroku auth:login

Enter the credentials for your Heroku account.

Done!

I’m dealing with video format of my new camera (Panasonic Lumix DMC-TS3). It’s the AVCHD format (.MTS file extension). You can convert it to other formats using HandBrake on Ubuntu.

O pre-requisito é o notify-send, um utilitário de linha de comando do libnotify. No Ubuntu:

sudo aptitude install libnotify-bin

E aqui o script em si:

sleep 5m; notify-send "aviso" "tirar o miojo do fogo"

Pronto, depois de cinco minutos isso vai aparecer:

Open Computer Vision Library or just OpenCV, is a cross-platform computer vision library focused on real-time image processing for video files or webcams.

You have two options to obtain the environment to develop on OpenCV. You can insert a new repository in your package manager or compile it by yourself.

For Ubuntu 9.10 Karmic Koala there’s this repository with OpenCV’s package.

To compile it you have to install some additional libraries compile it by your self. And it’s instructions vary for each distribution and version. For example, from Ubuntu Linux 9.10 to 9.04, the process varies slightly. I followed the instructions on this post “Installing OpenCV 2.0 on Ubuntu 9.10 Karmic Koala”.

After you have installed and have a well configured OpenCV development environment, you can compile a “source.c” file into a “program” binary like this:

gcc gcc source.c -o program `pkg-config opencv ‑‑libs ‑‑cflags`

Nem só de morte vive o kill.

Suponha que você tem um processo chamado program e quer congelar seu funcionamento. Para congela-lo sem mata-lo você pode mandar um sinal SIGSTOP com:

kill -s stop `pidof program`

Para ressuscitar o mesmo processo:

kill -s cont `pidof program`

Download

javafx4linux.tar.bz2 (~ 36Mb).

Installing

1) Extract the javafx4linux.tar.bz2 file. In this example I’m placing it on my Desktop. After the installing process you can remove it.

2) Open your NetBeans 6.5 and go at Tools → Plugins and go to Downloaded tab. In a plain and new NetBeans installation there will be no plugin in this tab yet.

3) Click on the Add Plugins button and head to the directory you extracted the file and select all .nbm files.

4) You will see a list of 22 plugins selected. Click on the Install button.

5) Just keep clicking on the Next button.

6) Check the license agreement accept box.

7) You’ll see a warning because the Linux pluggin is not signed. Don’t worry, just click Continue.

8) Click on Finish to restart NetBeans.

9) Now we can test it. Go at File → New Project, select the JavaFX on Categories and JavaFX Script Application on Projects.

10) Put some code and run it. There is. JavaFX on Linux.

Considerations

This is not a official of JavaFX for Linux! This solution was tested on Ubuntu 9.04 “Jaunty Jackalope” with Java 6 update 13 and NetBeans 6.5.1, but should also work with others Linux distributions and Java versions greater than 5.

Known bugs

As a non official workaround for JavaFX for Linux you may notice some drawbacks. Some parts of the JavaFX runtime rely on native implementations on the specific operational system. You may not use some multimedia capabilities as video playback, JavaFX Mobile emulator and some performance issues in some effects. Despite that, is perfectly possible to develop applications using JavaFX on NetBeans.

Thanks

I’d like to thanks some guys around the world. Weiqi Gao’s original post on JavaFX on Linux, HuaSong Liu article on DZone and Kaesar Alnijres post.

Nas versões anteriores do Ubuntu, inclusive no 8.04 que eu utilizava anteriormente, não havia do que me queixar. Porém com a mudança para o 9.04 (Jaunty Jackalope) de imediato foi possível reparar uma queda drástica na performance da aceleração gráfica 3D.

Minha placa gráfica no meu notebook, um Amazon FL31.

silveira@fl31:~$ lspci -nn | grep VGA
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller [8086:27a2] (rev 03)

Na release desta versão do Ubuntu havia um aviso de possível regreção na performance em placas de vídeo da Intel onde há a indicação de algumas soluções provisórias.

Regressão do Driver

Eu experimentei uma solução mais drástica que foi alternar o driver de vídeo para a versão anterior. O desempenho melhorou bastante, mas ainda senti uma boa diferença para os padrões que eu estou habituado. Além disso continuava impossível rodar alguns jogos, as texturas eram carregadas nos lugares errados e poucos quadros por segundo. Eu acabei por retornar os drivers para o default do Jaunty e descartar essa opção.

Atualização do Driver

Uma solução alternativa que eu me deparei foi atualizar os drivers para uma versão mais nova. Como root execute os comandos abaixo para adicionar os repositórios a lista do APT, adicionar suas chaves e atualizar as informações de pacote e instalar os novos drivers:

echo “deb http://ppa.launchpad.net/xorg-edgers/ppa/ubuntu jaunty main” >> /etc/apt/sources.list.d/intel.list

sudo apt-key adv –recv-keys –keyserver keyserver.ubuntu.com 165d673674a995b3e64bf0cf4f191a5a8844c542

aptitude update && aptitude safe-upgrade

A performance ainda não está tão boa quanto já foi mas está completamente suave e usável.

Those days I received my box of free Ubuntu CDs and sticks, free of charges.  Courtesy of Canonical throught the Ubuntu Shipit project, thanks guys! I love those Internet free stuff. It’s essential having a few CDs distros always with me.

JavaFX 1.0 is out and is absolutely amazing. You guys did really a great work on it.

As I really need a working SDK on Linux to continue to study and I don’t have any Windows/Mac near me, I’m using the Weiqi Gao’s workaround. I tried to simplify a little bit more the process for those who need JavaFX SDK working on Linux right now.

Download javafxsdk_linux_unofficial.tar.bz2 (~18Mb).

And then

tar -xjvf javafxsdk_linux_unofficial.tar.bz2
sudo cp javafx /opt/javafx
echo “PATH=\$PATH:/opt/javafx/bin” >> ~/.profile
echo “JAVAFX_HOME=/opt/javafx” >> ~/.profile
source ~/.profile

Now you can call javafx, javafxc, javafxdoc and javafxpackager from your terminal. Don’t forget that you need Java 1.6 or greater installed.

Here’s a video showing the SDK working, I’m compiling and running two sample applications. Remeber that as a temporary unofficial port for Linux, there’s not native video support nor hardware acceleration.

Inkscape is a Open Source vector graphics editor that works with SVG (Scalable Vector Graphics) format, Inkscape works with transparency, gradients, node editing, pattern fills, PNG export, and more. It also runs on Linux, Windows and OSX, those three are officially supported, but also runs in a broad list of Operational Systems. Is a software that I work daily and frequently is featured here in my blog.

You can download Inkscape or directly install it via some package system like Apt:

sudo apt-get install inskcape

But sometimes we need some special feature that is not available yet in the repositories or we want gain speed by having special binaries for our platforms or we want to help developing a new feature. In those cases we need to compile the software by ourself.

Those tips are valid for Ubuntu 8.04 but some part of them can be applied in others distributions. The Inkscape compiled here is the version 0.46+devel so newest versions can have compiling procedures slightly different.

Getting sources via APT.The easiest way to compile Inkscape on Ubuntu is

sudo su
apt-get build-dep inkscape
apt-get source inkscape
cd inkscape
./autogen.sh
./configure
make
make install

This will get a version of inkscape, compile it and install. If the first step doesn’t work well, you can try install all necessary packages by yourself using:

sudo apt-get install autotools-dev fakeroot dh-make build-essential autoconf automake intltool libglib2.0-dev libpng12-dev libgc-dev libfreetype6-dev liblcms1-dev libgtkmm-2.4-dev libxslt1-dev libboost-dev libpopt-dev libgsl0ldbl libgsl0-dev libgsl0-dbg libgnome-vfsmm-2.6-dev libssl-dev libmagick++9-dev libwpg-dev

Getting sources via SVN. The recipe I showed above will compile a stable version of Inkscape but not the last version of Inkscape. For that we need to grab the source directly from the Subversion repositories and so compile it.

At your home folder:

sudo apt-get install subversion
svn checkout https://inkscape.svn.sourceforge.net/svnroot/inkscape/inkscape/trunk inkscape

A alternative way to subversion is getting sources from here. Those are tarballs built every hour after someone change something in the development repositories. Download a tarball, and decompress it on your home folder.

Install all tools we need to compile Inkscape, this should fits:

sudo apt-get install autotools-dev fakeroot dh-make build-essential autoconf automake intltool libglib2.0-dev libpng12-dev libgc-dev libfreetype6-dev liblcms1-dev libgtkmm-2.4-dev libxslt1-dev libboost-dev libpopt-dev libgsl0ldbl libgsl0-dev libgsl0-dbg libgnome-vfsmm-2.6-dev libssl-dev libmagick++9-dev libwpg-dev

Enter in the directory with the Inkscape source and do:

./autogen.sh
mkdir build
cd build
../configure
make
sudo make install

In both cases, grabbing sources via svn or via apt, or can set the place where the software will be installed so it not cause conflicts with you already installed version of Inkscape. You can do that replacing the ./configure step with something like:

./configure –prefix=/home/yourname/inkscape

If you had some trouble in one of those steps, consider reading some of those other tutorials:

• http://www.inkscape.org/wiki/index.php/CompilingInkscape
• http://www.inkscape.org/wiki/index.php/CompilingUbuntu
• https://help.ubuntu.com/community/CompilingEasyHowTo

ps: thanks guys from the inkscape-devel@lists.sourceforge.net specially heathenx.