"Not just info dialogs
Zenity can do a lot more than just provide information dialogs --
handy though they are. It has a whole range of dialogs that you can
use to get user feedback and decision-making involved with your
scripts. Examples include not only the traditional errors,
warnings, questions and progress dialogs but things like calendars,
text entry, lists and file-selection. Without wanting to become a
replica of the zenity manual, let’s have a look at some of
them.
"Errors and warnings
In essence these two are the same as information dialogs but they
use a different icon on the dialog itself. This code displays a
warning dialog:"