Scheduler shell script in dbms_scheduler - oracle database script

-- This feature in available from oracle 12c onward  -- Create an credential store:  BEGIN dbms_credential.create_credential ( CREDENTIAL_NAME => 'ORACLEOSUSER', USERNAME => 'oracle', PASSWORD => 'oracle@98765', DATABASE_ROLE => NULL, WINDOWS_DOMAIN => NULL, COMMENTS => 'Oracle OS User', ENABLED => true ); END; /   -- Create the job:  exec dbms_scheduler.create_job(- job_name=>'myscript4',- job_type=>'external_script',- job_action=>'/export/home/oracle/ttest.2.sh',- enabled=>true,- START_DATE=>sysdate,- REPEAT_INTERVAL =>'FREQ=MINUTELY; byminute=1',- auto_drop=>false,- credential_name=>'ORACLEOSUSER');