When you write scripts, you can use  to create simple dialogs that interact graphically with the user, as follows:
You can create a dialog to obtain information from the user. For example, you can prompt the user to select a date from a calendar dialog, or to select a file from a file selection dialog.
You can create a dialog to provide the user with information. For example, you can use a progress dialog to indicate the current status of an operation, or use a warning message dialog to alert the user.
When the user closes the dialog,  prints the text produced by the dialog to standard error.
When you write  commands, ensure that you place quotation marks around each argument.
For example, use: zenity --calendar --title="Holiday Planner" Do not use: zenity --calendar --title=Holiday Planner
If you do not use quotation marks, you might get unexpected results.
