lsnrctl> set current_listener <listener name> 
lsnrctl> set log_file <sid name>.log

[oracle@jumper admin]$ lsnrctl 



lsnrctl for linux: version 9.2.0.4.0 - production on 10-nov-2006 16:54:16



copyright (c) 1991, 2002, oracle corporation.  all rights reserved.



welcome to lsnrctl, type "help" for information.



lsnrctl> set current_listener listener1
current listener is listener1
lsnrctl> set log_file
parameter value: a.log
connecting to (description=(address=(protocol=ipc)(key=extproc)))
listener1 parameter "log_file" set to a.log
the command completed successfully
lsnrctl> status
connecting to (description=(address=(protocol=ipc)(key=extproc)))
status of the listener
------------------------
alias                     listener1
version                   tnslsnr for linux: version 9.2.0.4.0 - production
start date                10-nov-2006 16:54:12
uptime                    0 days 0 hr. 2 min. 6 sec
trace level               off
security                  off
snmp                      off
listener parameter file   /opt/oracle/product/9.2.0/network/admin/listener.ora
listener log file         /opt/oracle/product/9.2.0/network/log/a.log
listening endpoints summary...
  (description=(address=(protocol=ipc)(key=extproc)))
  (description=(address=(protocol=tcp)(host=172.16.33.11)(port=1521)))
services summary...
service "plsextproc" has 1 instance(s).
  instance "plsextproc", status unknown, has 1 handler(s) for this service...
service "conner" has 1 instance(s).
  instance "conner", status unknown, has 1 handler(s) for this service...
service "eygle" has 1 instance(s).
  instance "eygle", status unknown, has 1 handler(s) for this service...
the command completed successfully
lsnrctl>

lsnrctl> save_config
connecting to (description=(address=(protocol=ipc)(key=extproc)))
saved listener1 configuration parameters.
listener parameter file /opt/oracle/product/9.2.0/network/admin/listener.ora
old parameter file /opt/oracle/product/9.2.0/network/admin/listener.bak
the command completed successfully

[oracle@jumper oracle]$ tail -5 /opt/oracle/product/9.2.0/network/admin/listener.ora


#----added by tnslsnr 14-nov-2006 16:39:12---
log_file_listener1 = a.log
#--------------------------------------------