redshift-scheduler, as the name implies is a scheduler program for redshift.
Redshift adjusts the color temperature of your screen according to your surroundings (meaning according to the time of day and your location). This may help your eyes hurt less if you are working in front of the screen at night.
However, not everyone has the same day-schedule and likes their screen "turning red" at ~17:00 in the afternoon.
redshift-scheduler uses a configuration file that specifies a number of rules. Rules define time periods within the day and their corresponding temperature (or temperature transition).
Generally, rules state something like this:
from 11:00 to 18:00, I'd like the maximum screen temperature (6500K)
from 18:00 to 20:00, I'd like a gradual decrease from 6500K to 5000K
from 20:00 to 23:30, I'd like a gradual decrease from 5000K to 4500K
See the README to learn more: https://github.com/spantaleev/redshift-scheduler
Any comments would be appreciated.