To learn more about printing on Red Hat Enterprise Linux, refer to the following resources.
map lpr — The manual page for the lpr command that allows you to print files from the command line.
man lprm — The manual page for the command line utility to remove print jobs from the print 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.