autostarting , shutting oracle 7.3.2.2 on hpux 10.20

I'm a little confused. I want to have oracle start and shut down when the system start or shuts, and following the directions in the installation guide (7.3.2.2) it states to create a file called oracle in the /sbin/init.d and include the commands: su oracle -c $ORACLE_HOME/dbastart and su oracle -c $ORACLE_HOME/dbastop
This file gets called by either links
/sbin/rc1.d/K100oracle -> /sbin/init.d/oracle
or
/sbin/rc2.d/S990oracle -> /sbin/init.d/oracle

which passes either 'STOP' or 'START' to the command procedure????? If so, I need to write a script that checks for these options and called either dbastart or dbastop. Is this correct. Isn't there an oracle supplied script that I should use for /sbin/init.d/oracle ?? Am I missing something?
Thanks for your help.

	Regards,
	John