Use the --notification option. Notification Icon

Use the --notification option to create a notification icon.

<cmd>--text</cmd>=<var>text</var>

Specifies the text that is displayed in the notification area.

The following example script shows how to create a notification icon:

#!/bin/sh zenity --notification\ --window-icon="info" \ --text="There are system updates necessary!"
Notification Icon Example Zenity notification icon example