Oracle 11g location of old type alert_orcl.log file

sqlplus system/sys@orcl

SQL*Plus: Release 11.2.0.1.0 Production on Mon May 16 16:01:50 2011

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Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> show parameter diag

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
diagnostic_dest string /opt/app/oracle
SQL> !pwd
/opt/app/oracle/diag/rdbms/orcl/orcl/trace

SQL> !ls -ltr alert_orcl.log
-rw-r----- 1 oracle oinstall 48551528 2011-05-16 02:50 alert_orcl.log

SQL>