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.

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

shutdown abort

and then startup normally

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