Extension attribute to determine the installed printer driver version for a given Xerox printer model.

get_printer_driver_version.sh

#!/bin/bash
# Determine the printer driver version using lpinfo

# I got the printer information by running:
#   [kris@Kris-MacBook-Pro ~]$ lpinfo --make-and-model "7225" -m
#   Library/Printers/PPDs/Contents/Resources/Xerox WorkCentre 7225.gz Xerox WorkCentre 7225, 3.123.0
#   [kris@Kris-MacBook-Pro ~]$ 
#
# for an HP I have I used: 
#   [kris@Kris-MacBook-Pro ~]$ lpinfo --make-and-model "hp laserjet p4010" -m
#   Library/Printers/PPDs/Contents/Resources/HP LaserJet P4010_P4510 Series.gz HP LaserJet P4010 Series
#   [kris@Kris-MacBook-Pro ~]$
# which did not return a version. YMMV. Printer driver makers DGAF.

printer="Xerox WorkCentre 7225"
driverversion=$(lpinfo --make-and-model "${printer}" -m | sed -n -e 's/^.*, //p')

if [[ ${driverversion} ]]; then
  result=${driverversion}
else
  result="Not Installed"
fi

echo "<result>$result</result>"

This assumes a structure of /path/to/driver Driver Name, version which isn't always the case:

Library/Printers/PPDs/Contents/Resources/HP Business Inkjet 2250.gz HP Business Inkjet 2250 PS - Ver 1.6
Library/Printers/PPDs/Contents/Resources/HP Business Inkjet 2280.gz HP Business Inkjet 2280 PS - v1.0
Library/Printers/PPDs/Contents/Resources/hp business inkjet 2300.gz HP Business Inkjet 2300 PS v3010.107
Library/Printers/PPDs/Contents/Resources/HP Business Inkjet 2600.gz HP Business Inkjet 2600 PS -RC-2.0
Library/Printers/PPDs/Contents/Resources/HP Color LaserJet CM1312 MFP Series.gz HP Color LaserJet CM1312 MFP Series
Library/Printers/PPDs/Contents/Resources/HP Color LaserJet CM1312 MFP Series Fax.ppd.gz HP Color LaserJet CM1312 MFP Series. Fax
Library/Printers/PPDs/Contents/Resources/Xerox Phaser 7500DT.gz Xerox Phaser 7500DT, 3.123.0

This works for my purpose (EA for Xerox driver) but if you want to do more sed/awk magic to make it "universal" be my guest.