To learn more about printing on Red Hat Linux, refer to the following resources.
man printcap The manual page for the /etc/printcap printer configuration file.
map lpr The manual page for the lpr command that allows you to print files from the command line.
man lpd The manual page for the LPRng printer daemon.
man lprm The manual page for the command line utility to remove print jobs from the LPRng spool queue.
man mpage The manual page for the command line utility to print multiple pages on one sheet of paper.
man cupsd The manual page for the CUPS printer daemon.
man cupsd.conf The manual page for the CUPS printer daemon configuration file.
man classes.conf The manual page for the class configuration file for CUPS.
http://www.linuxprinting.org GNU/Linux Printing contains a large amount of information about printing in Linux.
http://www.cups.org/ Documentation, FAQs, and newsgroups about CUPS.