Message from root script to users?

I have a daily backup script that is by cron each night. If there is a
failure during the backup process I would like to have the script to notify
the user and, if possible, allow the user to choose to cancel or re-try. Is
there a way to launch a message box or a dialog box (using zenity?) on a
user from the script that is running as root?

TIA

-------------------------------
Dave M
Davem (at) Mich (dot) Com
Ann Arbor, Mich. USA

Protect your digital rights: http://www.eff.org
"The 'Analog Holes' they want to stop up are our eyes, ears and mouths."


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