Locating install printer PPD driver url script Is it possible to output the PPD driver path my installed printer is using?
You can get information about the installed printer driver with system_profiler:

pse@Mithos:~$ system_profiler SPPrintersSoftwareDataType
Printer Software:

    PPDs:

      PPDs:
          Path: /Library/Printers/PPDs/Contents/Resources/CanonIJMG7100series.ppd.gz
          Version: 11.7.1.0
          Path: /Library/Printers/PPDs/Contents/Resources/CanonIJMP520series.ppd.gz
          Version: 10.84.2.0
          Path: /Library/Printers/PPDs/Contents/Resources/CanonIJMP540series.ppd.gz
          Version: 10.84.2.0
...