Are you running RAC/GI with role separation? You’re tired of constantly switching between “oracle” and “grid” users or you don’t have access to “grid” at all?
This little trick saves me lots of time whenever I need to check the status or services details of a listener running as “grid”. I hope it serves you as well as it does serve me 🙂

This gives me the listener names running on the connected node:

$ ps -ef|grep tnslsnr
grid      3468     1  0 21:50 ?        00:00:00 /u01/app/gi12201/bin/tnslsnr ASMNET1LSNR_ASM -no_crs_notify -inherit
grid      3643     1  0 21:50 ?        00:00:00 /u01/app/gi12201/bin/tnslsnr LISTENER -no_crs_notify -inherit
grid      3646     1  0 21:50 ?        00:00:00 /u01/app/gi12201/bin/tnslsnr MGMTLSNR -no_crs_notify -inherit
grid      3652     1  0 21:50 ?        00:00:00 /u01/app/gi12201/bin/tnslsnr LISTENER_SCAN3 -no_crs_notify -inherit
grid      3665     1  0 21:50 ?        00:00:00 /u01/app/gi12201/bin/tnslsnr LISTENER_SCAN2 -no_crs_notify -inherit

By default, every listener in a GI/RAC setup has an IPC end-point with the KEY being the same as the listener name. For instance:

Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER_SCAN1)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=192.168.56.55)(PORT=1523)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.56.55)(PORT=1521)))

So you can simply run lsnrctl with the connect descriptor on the command line (as oracle):

$ lsnrctl status "(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER_SCAN1)))"

LSNRCTL for Linux: Version 12.2.0.1.0 - Production on 17-MAY-2018 22:12:49

Copyright (c) 1991, 2016, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER_SCAN1)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER_SCAN1
Version                   TNSLSNR for Linux: Version 12.2.0.1.0 - Production
Start Date                17-MAY-2018 21:52:41
Uptime                    0 days 0 hr. 20 min. 8 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/gi12201/network/admin/listener.ora
Listener Log File         /u01/app/grid/diag/tnslsnr/ol7122rac2/listener_scan1/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER_SCAN1)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=192.168.56.55)(PORT=1523)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.56.55)(PORT=1521)))
Services Summary...
Service "65388e79ee096b69e0533238a8c08c32.localdomain" has 2 instance(s).
  Instance "RAC11", status READY, has 2 handler(s) for this service...
  Instance "RAC12", status READY, has 2 handler(s) for this service...
Service "RAC1.localdomain" has 2 instance(s).
  Instance "RAC11", status READY, has 2 handler(s) for this service...
  Instance "RAC12", status READY, has 2 handler(s) for this service...
Service "pdbrac1.localdomain" has 2 instance(s).
  Instance "RAC11", status READY, has 2 handler(s) for this service...
  Instance "RAC12", status READY, has 2 handler(s) for this service...
The command completed successfully

Yes, this only works for listeners that run on the node you’re connected to. You can’t do it across nodes, but I still find it extremely useful.

For your convenience, you can put the connect descriptors in the TNSNAMES.ORA sourced by “oracle”:

$ cat $TNS_ADMIN/tnsnames.ora 
listener_scan1=(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER_SCAN1)))

$ lsnrctl services listener_scan1

LSNRCTL for Linux: Version 12.2.0.1.0 - Production on 17-MAY-2018 22:30:10

Copyright (c) 1991, 2016, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER_SCAN1)))
Services Summary...
Service "65388e79ee096b69e0533238a8c08c32.localdomain" has 2 instance(s).
  Instance "RAC11", status READY, has 2 handler(s) for this service...
    Handler(s):
      "DEDICATED" established:0 refused:0 state:ready
         REMOTE SERVER
         (ADDRESS=(PROTOCOL=TCPS)(HOST=192.168.56.53)(PORT=1523))
...

It also works within the lsnrctl command line:

$ lsnrctl

LSNRCTL for Linux: Version 12.2.0.1.0 - Production on 17-MAY-2018 22:39:58

Copyright (c) 1991, 2016, Oracle.  All rights reserved.

Welcome to LSNRCTL, type "help" for information.

LSNRCTL> set current_listener (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER_SCAN1)))
Current Listener is (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER_SCAN1)))
LSNRCTL> services
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER_SCAN1)))
Services Summary...
Service "65388e79ee096b69e0533238a8c08c32.localdomain" has 2 instance(s).
  Instance "RAC11", status READY, has 2 handler(s) for this service...
    Handler(s):
      "DEDICATED" established:0 refused:0 state:ready
         REMOTE SERVER
         (ADDRESS=(PROTOCOL=TCPS)(HOST=192.168.56.53)(PORT=1523))
      "DEDICATED" established:0 refused:0 state:ready
         REMOTE SERVER
         (ADDRESS=(PROTOCOL=TCP)(HOST=192.168.56.53)(PORT=1521))
...

Any comments? I’m listening…