Why can I not run KDE redshift in a cronjob?

Asked Nov 07 '18 at 19:15

Active Nov 07 '18 at 19:15

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I'm running KDE Neon 5.14 (based on Ubuntu 18.04) and KDE Plasma 5.14.2.

A command redshift (/usr/bin/redshift) is provided to adapt the screen colors to red tones for evening/night. I can successfully run it on a terminal emulator, but not in a cronjob. This line from the user's crontab

15 19 * * * /usr/bin/redshift

has no effect.

What could be the reason? And how to correctly run redshift also as a cronjob?

asked Nov 07 '18 at 19:15

BowPark

4,895

See also: https://unix.stackexchange.com/questions/171744/changing-users-wallpaper-via-system-crontab – Jeff Schaller Nov 07 '18 at 19:58
@JeffSchaller It works with DISPLAY:=0.0. Thank you! – BowPark Nov 07 '18 at 21:25
Even if this question and also this question are related to this problem, neither of them directly provides the answer needed here, which is: DISPLAY:=0.0 must be set in the env of the cronjob. – BowPark Nov 07 '18 at 22:57

Why can I not run KDE redshift in a cronjob?

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