Resource Configuration Scripts
After init has been started, the remaining startup tasks in the system—the ones that start up all the services and operating system processes—are handled by the Resource Configuration scripts. These scripts can all be found inside the /etc/rc.d directory, which usually means “Resource Configuration Directory” (depending on who you ask).
Anything in /etc/rc.d is a resource configuration script, a program that starts up parts of FreeBSD according to the system's configuration. Some are called recursively from other programs, some do nothing in the out-of-the-box configuration, and some will probably never even be run. You will generally never need to modify any of the files in /etc/rc.d.
A few other files are in ...
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