How can I detect database role BEFORE mounting database?

Once a database is mounted, it is possible to query the V$database view to check the database_role IE: Primary, Physical Standby or Logical Standby.
When starting a Physical standby, the correct sequence is to:
SQL> startup nomount
SQL> alter database mount standby database
SQL> recover managed standby database nodelay disconnect
This will get it going without any errors in the alertlog (which we monitor and Email ORA- lines automatically). We Can get "ORA-01153: an incompatible media recovery is active" if the Primary is already up, but usually it wont, so Ignore this.
How can I determine the DB's role so I can issue the correct commands for startup, when the Instance is DOWN or in unmounted 'STARTED' mode?
(Unix, Solaris, 9i)
Regards, Vin.

Thank you for the reply.
I have decided that before a shutdown is done (and these stops & starts are all done from a script, middle if night when backups are done) , that it will check the 'open mode' of the database. If it isn't just STARTED, it has to be open or mounted & thus I can query the v$database view. This I will query and store in the form of a unix file named `uname -n`_SID_databaseRole IE:sunbox2_SALES_PHYSICAL.
I will look for these files before a startup and if present and less than an hour old, issue (in the case that we are starting a Physical standby) startup nomount, mount standby database, recover managed .....etc . If the database role is PRIMARY, then just issue a 'startup', same if for some reason the unix file doesn't exist or the file is more than an hour old. A plain startup on a Physical Standby can generate some messages, but it still works, and will prompt people to question why the backup took so long.
The only time this could all muck up is if we do a switchover at the same time as we shutdown for cold backups. I will make the policy that switchovers are not to be done at that time.
The only gripe I have left is that I cannot find how to STOP the Instance (message free) after doing a database dismount. A ' shutdown immediate' generates an ora 1109 message and I want to avoid prompting as many messages possible. Some messages are unavoidable and my "alertwatch" program is configured to blanket ignore them, but I want to use the correct commands to generate the least amount of messages that will be skipped for Emailing.

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