I use this in my .xinitrc, and keep redshift running all day. It automatically fades to red when the evening comes, and back again in the morning. nice redshif

I use this in my .xinitrc, and keep redshift running all day. It automatically fades to red when the evening comes, and back again in the morning. nice redshift -l <YOUR-LAT>:<YOUR-LON> -b 0.6 -t 5500:1900