/usr/sbin/lpadmin -p printer -E -v device -m ppd ENTER
E.g. 1
For an HP DeskJet printer connected to the parallel port this would look like:
/usr/sbin/lpadmin -p DeskJet -E -v parallel:/dev/lp0 -m deskjet.ppd ENTER
E.g. 2
Similarly, an HP LaserJet printer using a JetDirect network interface at IP address 11.22.33.44 would be added with the command:
/usr/sbin/lpadmin -p LaserJet -E -v socket://11.22.33.44 -m laserjet.ppd ENTER