[root@localhost ~]# su - oracle [oracle@db /home/oracle]$ lsnrctl startLSNRCTL for Linux: Version 10.2.0.1.0 - Production on 20-APR-2011 16:57:59Copyright (c) 1991, 2005, Oracle. All rights reserved.Starting /ORACLE/app/oracle/oracle/product/10.2.0/db_4/bin/tnslsnr: please wait...TNSLSNR for Linux: Version 10.2.0.1.0 - Production System parameter file is /ORACLE/app/oracle/oracle/product/10.2.0/..