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Archive for the 'Noobs' Category

R: Logical operators: Beware of the difference between “&&” and “&”

Friday, September 12th, 2008

There’s a tricky bit about R‘s logical operators, and though it’s described in the help pages that you get when you type, for example, ?”&” I still fall from it from time to time. (I think it has to do with my rudimentary knowledge and usage of “&&” for if-statements in bash shell scripts. Below […]

Screenshots with ImageMagick’s “import”

Monday, April 14th, 2008

For quick-and-dirty screenshots ImageMagick’s import command is unbeatable. sudo aptitude install imagemagick ImageMagick is worth getting for a lot of other reasons, too, just see man convert or man mogrify after installing. Here are the most important options for import import pic.jpg This changes the cursor to a crosshair — draw around the region you want […]

Quickly configure exim (MTA) on Gutsy

Monday, April 14th, 2008

sudo dpkg-reconfigure exim4-config This will give you a graphical interface and guide you through each step to get the basic setup.

Connecting Logitech Quickcam on Xubuntu Gutsy 7.10

Monday, April 14th, 2008

Works almost out of the box (Logitech Quickcam Messenger for 15 GBP on Amazon UK). Well, worked completely out of the box on the laptop. On the desktop, camorama complained “could not connect to device (/dev/video0). Please check connection”, and Skype said it didn’t find a device. However, /dev/video0 looked just the same as on […]

Sync tomboy via SSH

Monday, April 14th, 2008

Tomboy is a nifty little wiki-like application for taking notes on your desktop. You can sync two or more computers via SSH. If you have an account on a remote server and SSH access, the following screenshot shows how to do it. Note that I set restrictive permissions on the sync folder. For some bizarre […]