How to clean listener log on oracle 9i and 10g

Let, our database name is LIST_MYDB and listener for this database is LIST_MYDB.

If needed doe below:
open "listener.ora" and put ADMIN_RESTRICTIONS_l[istener_name]=off and RELOAD [listnere_name]"
then proceed as below:

1. stop logging
$ lsnrctl
LSNRCTL> set CURRENT_LISTENER LIST_MYDB
Current Listener is LIST_MYDB

LSNRCTL> set Log_status off
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=MYHOST)(PORT=1533)))
LIST_MYDB parameter "log_status" set to OFF
The command completed successfully

2. move the current log
$ mv list_mydb.log mv list_mydb.log_old

3. start logging
$ lsnrctl
LSNRCTL> set CURRENT_LISTENER LIST_MYDB

LSNRCTL> set Log_status on
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=MYHOST)(PORT=1533)))
LIST_MYDB parameter "log_status" set to ON
The command completed successfully

LSNRCTL> exit

If forgot to stop logging [step 1] then logging may stop automatically.
In this case after completing step 2, do as step 1 and then step 3.

Now do below if needed:
open "listener.ora" and put ADMIN_RESTRICTIONS_l[istener_name]=on and RELOAD [listnere_name]"