Welcome to Rob Groen's website

The Internet Jigsaw

Internet and internet systems are like one big jigsaw. Every piece has to be on the right place. If just one piece isn't right than you won't get the result you hoped for.

E-commerce specialist

I am a E-commerce specialist and can help you with many questions about this fantastic way of selling you products or services. In the late '90 I started a web shop for selling white-goods over the Internet on the Dutch marked. I was the first one who did that and there was no software like Drupal of OS-Commerce. I had to invent it all by myself. It was a great time!.
The shop was very successful and some day a big company made me an offer that I couldn't refuse. So I sold my e-commerce business.

Now I use my knowledge to advice and help other e-commerce companies to get better, grow and make more profit. My strength is the combination between technique and commerce.

Linux specialist

I am a Linux specialist and work with Linux since 1997. I am using mainly Debian based distributions like Debian and Ubuntu.
Please let me help you to find the pieces you need and how to stuck them together.Visit my Linux Tips & Trick page to see some helpful solutions.

Scheveningen Luxemburg Scheveningen

Classic SLS Rally

Since 1995 I drive with the technical service and repair group in the Classic SLS Rally. this Rally is for old car dated before 1975 and they drive from Scheveningen, a famous city on the west coast from The Netherlands, to downtown Luxembourg city and back again.

The rally includes 2 nightly stays in Belgium.

SLS Rally Medaille

Portfolio overview

A overview with some of my website projects. I prefer building websites in Drupal, Joomla and OS-Commerce.

Latest Tips & Tricks

My latests solutions for Linux software problems.
(English Only)

Drupal: Set file permission on filesystem with a shell script

This script is to set all file permissions at once for a Drupal website.

# Script made by David Rush, davidprush@gmail.com
# Changes the permissions of the Drupal sites directory to secure after isntallation
# Very Important Put this script in the same directory as your site/ directory

jpg text image to asci text on Ubuntu 12.04

On all my Ubuntu systems I used tesseract OCR to get ascii text from a image. Afeer upgrading to Ubuntu 12.04 this didn't work anymore. I keep getting te error:

actual_tessdata_num_entries_ <= TESSDATA_NUM_ENTRIES:Error:Assert failed:in file tessdatamanager.cpp, line 48

Repair corruct MYSQL tables

Did you ever get the message: followed with a body like this:

warning  : 1 client is using or hasn't closed the table properly
warning  : 1 client is using or hasn't closed the table properly

 Improperly closed tables are also reported if clients are accessing

Ubuntu 11.10 flash update failure

In the end of February 2013, after an update suddenly Firebird couldn't play flash anymore. The browser mentioned to install the latest Adobe flash Player so I was redirected to the Adobe download page where I could download the Adobe Flash Player 11.2 for my Ubuntu 11.10 distro.

iMac brightness setting script

I wrote a simple script to adjust the brightness om my iMac 27" running Ubuntu 11.10 oneiric. The script is using the gsd-backlight-helper that also available in Ubuntu precis 12.10 so I suppose this also works in 12.10. (let me know)

My solution is to add two brightness icons on the gnome-panel. One for brightness-up and one for brightness-down. (see screenshot)


Fotografie is al sinds mijn jeugd een hobby. In de jaren '70 fotografeerde ik met een 2-hands grootbeeld spiegelreflex camera. Echt een oudje en ondanks zijn leeftijd een prima camera. Dat was in die tijd normaal dat je naast je camera ook een aparte, losse belichtingsmeter bij je had. Immers met de camera kon je niets ander dan scherpstellen, de sluitertijd en het diafragma instellen.