Oracle log location in 11g

SQL> select * from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Production
PL/SQL Release 11.1.0.7.0 - Production
CORE    11.1.0.7.0      Production
TNS for Linux: Version 11.1.0.7.0 - Production
NLSRTL Version 11.1.0.7.0 - Production

SQL>  show parameter background

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
background_core_dump                 string      partial
background_dump_dest                 string      /oracle/app/oracle/diag/rdbms/PROD/PROD/trace

SQL> !ls -ltr /oracle/app/oracle/diag/rdbms/PROD/PROD/trace/al*
-rw-r----- 1 oracle oinstall 78512424 2011-10-03 02:00 /oracle/app/oracle/diag/rdbms/PROD/PROD/trace/alert_PROD.log

SQL>