Running Programs at Boot Time
The file /etc/rc.d/rc.local script is run by the
init command at boot time, or when changing
runlevels, after all other initialization is complete. You can use this
file to add additional commands necessary for your environment. For
instance, you can start additional daemons or initialize a printer.
In addition, if you require serial ports setup at boot time, you can
create and edit /etc/rc.serial. This script runs
setserial commands to configure the system's serial
ports. See the setserial man page for more
information.