ZENITY
zenity is a program that will display GTK+ dialogs, and return (either in the return code, or on standard output) the users input. This allows you to present information, and ask for information from the user, from all manner of shell scripts.
There are many different types of dialog boxes that the Zenity command can create. The following is a table that uses options (starting with — symbol immediately followed by a word to indicate the type dialog box to generate.
Dialog Options:
To Display Calendar : zenity — calendar
To display a Text dialog: zenity — entry
To display color selection dialog : zenity — color-selection
To display info dialog : zenity — info
To create a list option : zenity — list
To display warning: zenity — warning — text “<text>”
Display calendar inside a dialog box: zenity —info — text=”$(cal)” — width=200
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