Package zenity

Display dialog boxes from shell scripts

https://wiki.gnome.org/Projects/Zenity

Zenity lets you display Gtk+ dialog boxes from the command line and through
shell scripts. It is similar to gdialog, but is intended to be saner. It comes
from the same family as dialog, Xdialog, and cdialog.

General Commands
Command Description
zenity display GTK+ dialogs