How to display a license agreement during installation

Package files can be used to display text, or to run programs, during installation and/or removal. This feature is commonly used to display a license agreement during installation. To do this, the PKG file should include a line like the following:

"HelloWorld.txt"-"", FT, TA

No destination is specified, because the file is not installed. FT means that the file contains text to be displayed during installation and TA (text abort) specifies that the license agreement dialog will contain an option to abort the installation. If TA is not specified, the default is a dialog with a Continue button.