Change screen color temperature using the Xrandr extension
The original program was written by Ted Unangst (see http://www.tedunangst.com/flak/post/sct-set-color-temperature) who was so kind to put it under public domain.
In contrast to other programs that adapt color temperature, this programs minimizes the required dependencies to an absolute minimum.
Usage:
./sct TEMPERATURE
where TEMPERATURE is given between 1000K and 10000K (default 6500K)