Archive for February, 2009

Fixing TV-out in Vista (NVIDIA cards)

With TV-out sometimes Windows Vista only shows a black screen on the TV. Playing around with the software settings often does not remedy the problem.

The following things may help in this situation:

  1. Use output device switch hotkey when working on a laptop (e.g. Fn+F8)
  2. Restart windows using VGA (low-resolution) mode
Friday, February 27th, 2009 Uncategorized No Comments

Finding out UUIDs of disks

ls -l /dev/disk/by-uuid/

Sunday, February 15th, 2009 Uncategorized No Comments

Linux command line arithmetic calculations

We can use the expr tool to calculate integer number expressions:


expr 5 + 5

10

However, when we want to calculate something more complex like for example 5 + 5 * 6, expr makes things very complicated. It may be possible to do this, but it’s always a hassle with syntax.

Instead, one can use bc. A simple expression might be:


echo "(5 + 5) * 6" | bc

60

whereas a more complex expression (like Sin(pi) + e^2 * (3.5 + arctan(0))) is also possible:


echo "scale=10; pi=4*a(1); s(pi) + e(2) * (3.5 + a(0))" | bc -l

25.8616963464

Friday, February 13th, 2009 Uncategorized No Comments

Postfix catch-all for local domain

To set the catchall for “mydomain.nl” to info@mydomain.nl, use postconf as follows:


postconf -e "luser_relay=info@mydomain.nl"

postconf -e "local_recipient_maps="

Sunday, February 1st, 2009 Uncategorized No Comments