check/start Oracle listener

If the Oracle listener is running, you’ll get the following message.

$ lsnrctl status

LSNRCTL for Linux: Version 11.1.0.6.0 - Production on 04-APR-2009 16:27:02

Copyright (c) 1991, 2007, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.1.2)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 11.1.0.6.0 - Production
Start Date                29-APR-2009 18:43:13
Uptime                    6 days 21 hr. 43 min. 49 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /u01/app/oracle/product/11.1.0/network/admin/listener.ora
Listener Log File         /u01/app/oracle/diag/tnslsnr/devdb/listener/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.2)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC)))
Services Summary...
Service "devdb" has 1 instance(s).
  Instance "devdb", status UNKNOWN, has 1 handler(s) for this service...
Service "devdb.thegeekstuff.com" has 1 instance(s).
  Instance "devdb", status READY, has 1 handler(s) for this service...
Service "devdbXDB.thegeekstuff.com" has 1 instance(s).
  Instance "devdb", status READY, has 1 handler(s) for this service...
Service "devdb_XPT.thegeekstuff.com" has 1 instance(s).
  Instance "devdb", status READY, has 1 handler(s) for this service...
The command completed successfully

start listener:

$ lsnrctl start
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