dbstart in Oracle 10g doesnt work...

[SyedK]

OK here it is :
I installed Oracle 10g Express Edition.
Installation completed successfully.
I did a reboot.
Then opened terminal and :

sk@sk-OEM:~$ su - oracle
Password:
oracle@sk-OEM:~$ lsnrctl start
lsnrctl: command not found
oracle@sk-OEM:~$ ORACLE_HOME=/usr/lib/oracle/xe/app/oracle/product/10.2.0/server
oracle@sk-OEM:~$ PATH=$PATH:$ORACLE_HOME/bin
oracle@sk-OEM:~$ export ORACLE_HOME
oracle@sk-OEM:~$ export ORACLE_SID=XE
oracle@sk-OEM:~$ export PATH
oracle@sk-OEM:~$ lsnrctl start

LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 11-FEB-2011 14:09:26

Copyright (c) 1991, 2005, Oracle. All rights reserved.

TNS-01106: Listener using listener name LISTENER has already been started

oracle@sk-OEM:~$ dbstart
dbstart: command not found

I googled it ... i searched ... but couldnt find anything.
What should I do ... ?


PS. I'm a newbie