Errors while bringing up Oracle database in OEL (Linux)

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Procedure followed to bring up the Oracle DB:

1) Login with the su - oracle user
2) sqlplus / as sysdba
3) Check the lsnrctl status if it is not up start by using lsnrctl start

4) Execute "startup" command after login to sqlplus / as sysdba
5) If you encounter with this error:
ORACLE_HOME_LISTNER is not SET, unable to auto-start Oracle Net Listener

Check if ORACLE_HOME_LISTNER path is set in the .profile
Execute the .profile
Execute tnsping <ORASID>

6) Login  sqlplus / as sysdba
7) Execute "startup"

Encountered with following error:

ORA-01078: failure in processing system parameters
LRM-00109: could not open parameter file '/home/app/oracle/product/11.2.0/db_1/dbs/initDB11G.ora'

8) Login with sqlplus sys/Password as sysdba
9) Check for the existence of spfile under this path "/home/app/oracle/product/11.2.0/db_1/dbs/spfileorcl.ora"
10) Execute " create pfile from spfile='/home/app/oracle/product/11.2.0/db_1/dbs/spfileorcl.ora' "
11) Once hc_<ORASID>.dat and init<ORASID>.ora files are created
12) Login  sqlplus / as sysdba
13) Execute "startup"

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