Permanently delete oracle from Centos

The following is an example of 9.0.4
1. log on with an oracle user
If you want to install it again, you 'd better back up the data first.
The script includes the user's login script, the script for automatic database startup and shutdown, and the script for automatic Listener startup.
If it is possible to save the script for creating a database

2. Use SQL * PLUS to stop a database
[Oracle @ ora920 oracle] $ sqlplus/nolog
SQL> connect/as sysdba
SQL> shutdown [immediate]
SQL> exit

3. Stop Listener
[Oracle @ ora920 oracle] $ lsnrctl stop

4. Stop the HTTP service
[Oracle @ ora920 oracle] $ ORACLE_HOME/Apache/bin/apachectl stop

5. Use su or log on to the root again (if you want to reinstall it, You can retain the oracle user, saving you the need to enter environment variables)

6. Delete the installation directory
[Root @ ora920/root] # rm-rf/opt/oracle/

7. delete files under/usr/bin
[Root @ ora920/root] # rm/usr/bin/dbhome
[Root @ ora920/root] # rm/usr/bin/oraenv
[Root @ ora920/root] # rm/usr/bin/coraenv

8. delete/etc/oratab
[Root @ ora920/root] # rm/etc/oratab

9. delete/etc/oraInst. loc
[Root @ ora920/root] # rm/etc/oraInst. loc

10. Delete the oracle user (to reinstall, do not delete it)
[Root @ ora920/root] # userdel-r oracle

11. Delete the user group (to reinstall it, Do not delete it)
[Root @ ora920/root] # groupdel oinstall
[Root @ ora920/root] # groupdel dba

12. Delete the startup Service
[Root @ ora920/root] # chkconfig -- del dbora