Oracle error on startup "another startup/shutdown operation of this instance in progress"

I made a mistake in starting my local oracle instance. I did not set the oracle_sid before issuing sqlplus "sys as sysdba" and S开发者_运维问答QL> startup. Now I am unable to startup my instance. Please help me know how to shutdown the erroneous instance. Thanks.

close all sessions for this instance, or connect as sysdba and execute

shutdown abort

and then startup normally

Rename the file $ORACLE_HOME/dbs/lkinst<instance_name> . Then try shutdown abort