Hi,

many thanks to both of you for your replies.

I tried to pass DISPLAY env to cron without success: how is it done?

sctd is not a viable answer as it works just with fixed increments or decrements; and from man sct:

 "sct samples the color ramp in interval steps of 500 with temp values
     between steps being interpolated."

So I doubt decrements of two every minute would guarantee white balance quality...

On 29/10/20 16:53, Joerg Jung wrote:
On 27. Oct 2020, at 16:10, avv. Nicola Dell'Uomo 
<nicola.dellu...@delluomo-morettin.com> wrote:

maybe I'm missing something trivial, but I can't figure out how to cron sct(1)

My user cron config works and cron log reports sct was executed, but screen 
temp doesn't change ...

Here's my user crontab:

#       $OpenBSD: crontab,v 1.28 2020/04/18 17:22:43 jmc Exp $
#
# SHELL=/bin/sh
PATH=/bin:/sbin:/usr/bin:/usr/sbin
HOME=/var/log
#
#minute hour    mday    month   wday    [flags] command
#
# rotate log files every hour, if necessary
# 35    19       *       *       *      touch /home/nicola/sct

35    19       *       *       *      /usr/local/bin/sct  5000

# touch /home/nicola/sct was a test in order to verify I had not misconfigured 
crontab.
# cron was tested with SHELL variable defined and then commented out and the 
result was the same.
FYI, there is a small sctd in the sct package, which probably
does exactly what you try to achieve manually here.

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