This allows you to start a SQL*Plus session without connecting to a database:
-bash-3.2$ sqlplus /nolog
SQL*Plus: Release 12.1.0.2.0 Production on Wed May 22 08:27:44 2019
Copyright (c) 1982, 2014, Oracle. All rights reserved.
SQL> select sysdate from dual;
SP2-0640: Not connected
SQL> show user
USER is ""
SQL>
-bash-3.2$ sqlplus /nolog
SQL*Plus: Release 12.1.0.2.0 Production on Wed May 22 08:27:44 2019
Copyright (c) 1982, 2014, Oracle. All rights reserved.
SQL> select sysdate from dual;
SP2-0640: Not connected
SQL> show user
USER is ""
SQL>
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