Running Zenity in Crontab

What is Zenity?

  It is a GNOME application that produces pop-up windows that can be used to send message to user. It also have file selection capabilities by using --file-selection option.

  Example usage are:

  zenity --info # sends a simple pop up message
  zenity --info --text="Backup is running, press OK to close this window"  # with user-defined message

How to run this in CRON?

  Since CRON doesn't process X applications by default, you need to add the following option:

  zenity --info --text="Hi, I was launched via CRON" --display=:0

Sources

http://promberger.info/linux/2009/01/02/running-x-apps-like-zenity-from-crontab-solving-cannot-open-display-problem/

zenity(1)