Specification for CUPS printing options
Documentation

The standard documentation of cupsd configuration file is available with:

man cupsd.conf


Modification

These options are configured through the cupsd configuration file which is:

/etc/cups/cupsd


If cupsd is running it will overwrite it. Hence so as to be able to edit it, here is how to proceed:


stop cupsd:

cd /System/Library/LaunchDaemons
/usr/bin/sudo launchctl unload org.cups.cupsd.plist

edit cupsd configuration file:

cd /etc/cups
cp cupsd.conf cupsd.conf.orig
vi cupsd.conf

start cupsd:

cd /System/Library/LaunchDaemons
/usr/bin/sudo launchctl load org.cups.cupsd.plist