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Run zenity or any other GUI based program through cron.

 a shell script file like and following code and then add shell script in cron.

Cron Entry
* * * * * /var/www/html/runcron.sh


Shell Script
#!/bin/bash

touch /var/www/html/tfile
dbus_session_file=/home/suntec/.dbus/session-bus/$(cat /var/lib/dbus/machine-id)-0
if [ -e "$dbus_session_file" ]; then
  . "$dbus_session_file"
  export DBUS_SESSION_BUS_ADDRESS DBUS_SESSION_BUS_PID
  dbus-send …
fi

zenity --error --text='Fill Time sheet' --display=:0.0

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