title: listener.ora, tnsnames.ora & sqlnet.ora not in $ORACLE_HOME/network/admin
body: <p>I'm currently exploring the Oracle Database 21c but I just realised that my listener.ora, tnsnames.ora &amp; sqlnet.ora is not in the $ORACLE_HOME/network/admin by default.</p>
  <p>I'm running Oracle Linux 7 on docker and this is my output</p>
  <pre><code>[oracle@d62a3728924b scripts]$ lsnrctl status
  
  LSNRCTL for Linux: Version 21.0.0.0.0 - Production on 15-OCT-2021 18:14:54
  
  Copyright (c) 1991, 2021, Oracle.  All rights reserved.
  
  Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
  STATUS of the LISTENER
  ------------------------
  Alias                     LISTENER
  Version                   TNSLSNR for Linux: Version 21.0.0.0.0 - Production
  Start Date                15-OCT-2021 18:06:27
  Uptime                    0 days 0 hr. 8 min. 26 sec
  Trace Level               off
  Security                  ON: Local OS Authentication
  SNMP                      OFF
  Listener Parameter File   /u01/app/oracle/homes/OraDB21Home1/network/admin/listener.ora
  Listener Log File         /u01/app/oracle/diag/tnslsnr/d62a3728924b/listener/alert/log.xml
  Listening Endpoints Summary...
    (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=d62a3728924b)(PORT=1521)))
  Services Summary...
  Service &quot;ORCL&quot; has 1 instance(s).
    Instance &quot;ORCL&quot;, status READY, has 1 handler(s) for this service...
  Service &quot;ORCLXDB&quot; has 1 instance(s).
    Instance &quot;ORCL&quot;, status READY, has 1 handler(s) for this service...
  The command completed successfully
  </code></pre>
  <p>My $ORACLE_HOME is in a different location</p>
  <pre><code>[oracle@d62a3728924b scripts]$ echo $ORACLE_HOME
  /u01/app/oracle/product/21.0.0/dbhome_1
  </code></pre>
  <p>How can I change the Listener Parameter File to point to $ORACLE_HOME/network/admin?</p>