Thank you Olivier :)
On Thu, 2008-01-31 at 20:12 +0100, Olivier Robert wrote:
Hi,
- "How can I determine what the user responds, is there errorlevels
or anything like that?"
You can check for the exit status of the xmessage command
- "What is the reason for doing ' > /dev/null 2>&1'"
It redirects any standard out and standard error to oblivion
Let's say you have a vnc session on port 5902. You want a script that checks if there's a session and display a message to the user. And you want to know if the user read the message. Here's what you could do. (you'll have to adapt and add a loop in there if you have several vnc sessions)
Edit the linux user's ~/.vnc/xstartup and add an "xhost +" in it. Otherwise you will not be able to display the message.
Use a script similar to this one: (of course, you will adapt and enhance)
#!/usr/bin/env bash
netstat -tape | grep ESTABLISHED | grep Xvnc | awk '{print $4}' | awk -F ":" '{print $2}' > log-ports
for user in `cat log-ports` do case $user in 5902) export DISPLAY=:2.0; xmessage -buttons "I understand":10 -center -timeout 60 -file testmsg > /dev/null 2>&1 [ $? -eq 10 ] \ && echo "$user acknowledged!" \ || echo "No answer from $user!" ;; esac
done
The user connected to 5902 will get a windowed message with a "I understand" button. If he clicks on it, you'll know. If he doesn't, it'll time out after 60 seconds and return an exit status of 0 (zero): you'll know too .
Hope it helps, Olivier
Thank you very much, I learned so much from your answer so that I will be busy programming scripts for a long time.
Henning Larsen