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ORA-01034, ORA-27101 and Linux errors on Fedora Core 2

I have been trying for days to get Oracle 10g up and running on Fedora Core 2. I have followed Werner's directions exactly, but keep receiving the following errors when I log into SQL*Plus. I have tried all the solutions on your Web site.
[oracle@internal bin]$ ./sqlplus

SQL*Plus: Release - Production on Mon Jul 12 22:45:24 2004
Copyright (c) 1982, 2004, Oracle.  All rights reserved.

Enter user-name: SYS
Enter password:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux Error: 2: No such file or directory

Make sure that you have set the ORACLE_SID and exported it in your environment. If your instance is up and running, then you likely have enough shared memory and semaphore resources. I know Werner's instructions include information about setting up the proper kernel parameters, so if you followed those instructions, you should already have things set up right. If you're attempting to start the instance, you should connect like this:
sqlplus '/ as sysdba'
and hopefully things will go better -- or at least your error will change!

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