/etc/rancid/rancid.conf
In this article you can find description of parameters in rancid.conf. By changing parameters in this file you can impact the way RANCID will behave, collect and process collected information. You can also define type of version control repository and email notifications as well as many other option.
Info
Information in this article are from rancid.conf(5) man pages included with RANCID.