Solution 1:
[oracle@server1 trace]$ cp listener.log listener_backup.log
[oracle@server1 trace]$ cat /dev/null>listener.log
[oracle@server1 trace]$ gzip listener_backup.log
Solution 2:
[oracle@server1 ~]$ lsnrctl
LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 02-JAN-2012 13:17:22
Copyright (c) 1991, 2011, Oracle. All rights reserved.
Welcome to LSNRCTL, type "help" for information.
LSNRCTL> show current_listener
Current Listener is LISTENER
If you want to change the current listener then execute the following command:
LSNRCTL> set current_listener <listenername>
LSNRCTL> set log_status off
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=server1.test.com)(PORT=1521)))
LISTENER parameter "log_status" set to OFF
The command completed successfully
From another window rename the log file, then return to previous window.
[oracle@server1 trace]$ mv listener.log listener_backup.log
LSNRCTL> set log_status on
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=server1.test.com)(PORT=1521)))
LISTENER parameter "log_status" set to ON
The command completed successfully
This will create a new and empty listener.log file which will continue logging.