determine a display used by gnome-session

[Staszek Hodur]

Hi all,
I am trying to write a simple script to control the amount 
of time my kids are spending at the computer. Fortunately, 
there are no Windows, no Gates etc. :-)

The script is supposed to run in cron. If the time is up, 
the script will display a message and close the session. I 
can get all the X sessions and all the Gnome session, say:
# ps -fe
...
root      2448   952  0 Dec26 tty7     00:48:16 /usr/bin/X 
:0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
staho     2555   952  0 Dec26 ?        00:00:00 
/usr/bin/gnome-session --session=ubuntu
root      6529   952  1 18:27 tty8     00:01:25 /usr/bin/X 
:1 -auth /var/run/lightdm/root/:1 -nolisten tcp vt8 -novtswitch
nadzia    6640   952  0 18:27 ?        00:00:00 
/usr/bin/gnome-session --session=ubuntu
...
To display a message I do:
# su staho -c 'zenity --info --display=:0'
# su nadzia -c 'zenity --info --display=:1'
as zenity cannot open display if run by an incorrect user 
(not even for root -- why?).

The problem is there is no visible link between X and Gnome. 
I mean, one can compare the dates and times, but using it 
looks ugly and unsure.
So, my question is: how to determine which gnome-session 
process is connected to which display?

Ekhm, "press alt-ctrl-t and type echo $DISPLAY" would not be 
the answer the Tiggers like best. ;-)
Happy New Year!
__
Stanislas Hodur




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