Redshift is a nice Linux tool for adjusting the color temperature of the screen according to time of the day.
At night this tool makes the screen a bit warmer, so your eyes wont “hurt” so much of the otherwise so bright display of your desktop background, browser or editor.
You provide the tool with your approximately geo coordinates and some value for upper and lower limit of color temperature, then it will automatically and continuously change color temperature all through day and night.
Example command for running this tool, if your’re in Norway:
$ redshift -l 60.0:10.0 -t 5700:3600 -g 0.8 -m vidmode -v