Why can I not run KDE redshift in a cronjob?

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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?






terminal cron kde







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  • Possible duplicate of What is DISPLAY=:0?
    – Jeff Schaller
    37 mins ago










  • See also: unix.stackexchange.com/questions/171744/…
    – Jeff Schaller
    37 mins ago














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0
down vote

favorite












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?






terminal cron kde







share|improve this question





















  • Possible duplicate of What is DISPLAY=:0?
    – Jeff Schaller
    37 mins ago










  • See also: unix.stackexchange.com/questions/171744/…
    – Jeff Schaller
    37 mins ago












up vote
0
down vote

favorite









up vote
0
down vote

favorite











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?






terminal cron kde







share|improve this question













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?






terminal cron kde




terminal cron kde






share|improve this question













share|improve this question











share|improve this question




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asked 1 hour ago









BowPark

1,50182443




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  • Possible duplicate of What is DISPLAY=:0?
    – Jeff Schaller
    37 mins ago










  • See also: unix.stackexchange.com/questions/171744/…
    – Jeff Schaller
    37 mins ago
















  • Possible duplicate of What is DISPLAY=:0?
    – Jeff Schaller
    37 mins ago










  • See also: unix.stackexchange.com/questions/171744/…
    – Jeff Schaller
    37 mins ago















Possible duplicate of What is DISPLAY=:0?
– Jeff Schaller
37 mins ago




Possible duplicate of What is DISPLAY=:0?
– Jeff Schaller
37 mins ago












See also: unix.stackexchange.com/questions/171744/…
– Jeff Schaller
37 mins ago




See also: unix.stackexchange.com/questions/171744/…
– Jeff Schaller
37 mins ago















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