sending messages

[Nils Kassube]

Shali 9846303531 wrote:
> I am an Asst Librairan providing internet services, i am using ubuntu
> systems for internet services,some times i need to pass some messages
> to the internet users, is it possible to sending those messages through
> systems???please suggest....

I think, what you are looking for is the command xmessage. You should 
login to the user's machine via ssh. Then the command would be something 
like

sudo su username -c 'DISPLAY=:0.0 xmessage -timeout 5 hello'

Replace username with the user's login and hello with your message. For 
more options see:

man xmessage


Nils