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How do I create a shell script that would generate a system notification.

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# 1  
Old 06-06-2011
How do I create a shell script that would generate a system notification.
I am a student, and I have project to complete. The project is to create a power point presentation with the following guidelines:
You are the system admin for a medium sized Internet company that has its primary production web server running on UNIX/Linux. Your technical IT director would like for you to do a presentation on a system admin task that you have automated with the use of the shell (your choice of shell, Bourne, C, Korn, Bash, etc...). I would like to have a system notification that will come up if a user logs on within 4 hours of a schedualed system maintenece down time, and again 30 minutes before the down time, that would state " A schedualed system maintenence will begin at 2:00 am. Please please save and exit any web based applications by 1:55 am in order to avoid loss of data."
Can any of you give me an idea of how to create this type of shell script?
# 2  
Old 06-06-2011
Do not post classroom or homework problems in the main forums. Homework and coursework questions can only be posted in this forum under special homework rules.

Please review the rules, which you agreed to when you registered, if you have not already done so.

More-than-likely, posting homework in the main forums has resulting in a forum infraction. If you did not post homework, please explain the company you work for and the nature of the problem you are working on.

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