Grimoire-
Command
.es

GNU+Linux command memo

Protect your eyes from screen's blue light

Protéger vos yeux de la lumière bleue des écrans

# apt install redshift-gtk
$ man redshift

You need to set a config file with your GPS coord and red levels for day and night:

~/.config/redshift.conf

; Global settings
[redshift]
temp-day=3500
temp-night=2500
transition=1
location-provider=manual
verbose=yes

; The location provider and adjustment methode settings are in their own sections.
; (1)
[manual]
lat=48.860
lon=2.346
1 OpenStreetMap.org is a good place to get GPS coordinates of your position.
Impossible to specify the option manual. : this error is caused by a syntax error in the configuration file, such as exta-spaces at the end of the latitude and longitude lines (which can appear after a copy/paste operation).