Simple Process to Install zenity

What is “zenity” Package?

GTK+ dialog boxes for the command-line
For more details: https://live.gnome.org/Zenity

Installation

• Open Terminal by pressing command+space then type terminal and hit Enter key.
• Install homebrew first.

  ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

• Install zenity.

  brew install zenity

Now, use zenity!