Thursday, May 31, 2018

Open alternative to propietary software (IX): ClamWin/ClamAV the open source antiviral software

Windows users need an antiviral software to get a minimal security, although given how vulnerable this system none of them is completely effective.
Privative antivirus usually eat a lot of resources of your computer, run for a short time because the licence expires and requires more money to update it (an non-update antivirus is useless), dirts your system, complete uninstall is very difficult, etc...
Clamwin is a different antiviral software: it can run on a pentium II without hang it, you can update the database viruses everyday and free and you can uninstall when you like as any other Windows software and it's open source.

The fact that it is a free program is a guarantee against suspicions, more judicious than paranoid, about the true intentions of most antiviruses and to what extent they protect or are part of the problem: a free antivirus does not benefit as much from the proliferation of viruses as the private ones that make their business go very well.
There is also a GNU/Linux version called Clamav.
I personally do not see any sense to have an antivirus in a system in which viruses do not pass theoretical experiments without practical danger.

You can keep safe your GNU/Linux updating the system and a bit of common sense.
Artículo original en castellano

Tuesday, May 15, 2018

How to compile and install povray in Ubuntu, Debian and distro derivates

Povray is a ray tracer available for several systems, although on unix systems you need to compile it, but it's easy following these steps:

Compile and install

Install the libraries you need to compile:
sudo apt-get install zlib1g-dev libpng12-dev libjpeg-dev libtiff5-dev libopenexr-dev libsdl1.2-dev libboost-system1.55-dev libboost1.55-dev git
Download the latest source code:
git clone povray
Compile and install:
cd povray/unix
cd ..
./configure COMPILED_BY="your name" LIBS="-lboost_system -lboost_thread"
sudo make install
Now, povray is installed in your computer.

Note: You needn't LIBS="-lboost_system -lboost_thread" in Debian.

How to use

You can generate a Full HD image with this command:
povray -W1920 -H1024 file.pov

Pov file is a text file with all the instructions in povray language to render a image (may be a very big file).

You can get amazing images like this:

Artículo original en castellano