Switching to an Oracle user

First, run the following command to log in as an oracle user:

          $ su - oracle

In this case, the user was a student and after running this command, the user will be oracle.

Now, log in to your Oracle Database by running the following command:

          $ sqlplus sys as sysdba

Enter the password you set earlier when installing Oracle. After the successful execution of this command, you will get the SQL> prompt:

[oracle@localhost work]$ sqlplus sys as sysdba 
SQL*Plus: Release Production on Mon Apr 30 12:02:53 2018 
Copyright (c) 1982, 2009, Oracle.  All rights reserved. 
Enter password:  
Connected to an idle instance. 

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