Due to a problem in the Quartus® Prime Software version 18.0 or early, the Programming File Generation command is not included as part of the supported command line executables.
To work around this problem, you can execute the following command 'quartus_pfg --help=c' on the Quartus® Prime installation path, to display the help page of the Programming File Generation executable.
The help page will be included in the Quartus® Prime Command-Line and TCL API Help on a future release of the Quartus® Prime Software.