yad notification does not work when started at boot

[peer]

I have the following test script that I want to run at boot.

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#!/bin/bash
exec 3>&1 4>&2
trap 'exec 2>&4 1>&3' 0 1 2 3
exec 1>log.out 2>&1
echo "script started" > logFile 
#export DISPLAY=:0.0
/usr/bin/yad --notification 
echo "script ended" >> logFile

The only thing this script is supposed to do is show an icon on the panel.
When I ran the script as user or as root it works.

When i add the script to cron as user or as root the icon is not shown.
In the logfile log.out I get the following error:

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Unable to init server: Could not connect: Connection refused

(yad:682): Gtk-WARNING **: 13:01:18.954: cannot open display: 

I tried to add the line "export DISPLAY=:0.0¨ but that did not help.

Can anybody help me with this problem???

[Head_on_a_Stick]

I tried to add the line "export DISPLAY=:0.0¨ but that did not help.

It that really the value of $DISPLAY for your graphical desktop? It's usually ":0" rather than ":0.0".

Check with

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echo $DISPLAY

[peer]

you are right.
the value of $DISPLAY = 0:

Strange, the script does run properly at boot now without any errors. I did not make any changes so I do not know what went wrong yesterday.

[Head_on_a_Stick]

It might make more sense to add the yad command to ~/.xsessionrc, any commands in that file will be run when the graphical desktop starts.

https://wiki.debian.org/Xsession

[peer]

I want to use the yad command in a larger update script.
Yesterday I also added the script to the autostart section. That's why the yad icon worked.
I tried the line: export DISPLAY=:0 in the script but I still got the error message

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Unable to init server: Could not connect: Connection refused

(yad:678): Gtk-WARNING **: 12:23:28.973: cannot open display: :0

Probably the problem has to do with the first line in the error message: the init server

I will make a workaround
1. a script started at reboot by cron, checkes for updates and stores the number of updates
2. a script in the autostart section that uses yad and notify-send for informing the user

[Head_on_a_Stick]

the first line in the error message: the init server

Perhaps the script is being run before the X session starts.