You can replace the 'normal' /usr/bin/lp (or wherever it is) with lp-cups, what got installed with your cups-package. Easy way is to #mv lp lp.backup and then copy lp-cups to this directory and just rename it to 'lp.
Try: #lp-cups textfile.txt and it should work. Cheers herbs -- ******* Herbert Langhans, Warschau ******* Sprachtraining Langhans ******* http://www.langhans.com.pl ******* herbert at langhans.com.pl ******* NIP 526-229-61-51 ******* Regon 014911759 ******* Tel. 603 341 441