How to Find the number of Databases in a server.

HI,
Please tell me how to find the number of Databases are in a server . when the DB is not up.
ps -ef | grep ora_
This i know whether our DB is up or not. But i want to know how many databases are in a server .If the database is down .
Cheers,
Gobi.

Hi,
[oracle@oralinux admin]$ lsnrctl status
LSNRCTL for Linux: Version 9.2.0.4.0 - Production on 01-DEC-2006 16:25:41
Copyright (c) 1991, 2002, Oracle Corporation. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC)))
TNS-01169: The listener has not recognized the password
[oracle@oralinux admin]$
Plz give me the solution.
Cheers ,
Gobi.

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