[oracle@rac1 ~]$ cat login.sh
#!/bin/sh

export ORACLE_SID=$1
#if [[ $(ps -ef|grep smon|grep -v grep|grep ${ORACLE_SID}|wc -l) -gt "0" ]]; then
if [[ $(ps -ef|grep smon|grep -v grep|grep ${ORACLE_SID}|wc -l) > "0" ]]; then
#export ORACLE_HOME=`cat /etc/oratab|grep ${ORACLE_SID}|cut -d":" -f2`
export ORACLE_HOME=/opt/oracle/product/11.1.0/db_1
sqlplus "/as sysdba"
else
echo "The db is down/Verify the db name"
fi
exit


[oracle@rac1 ~]$ chmod 700 login.sh


[oracle@rac1 ~]$ ./login.sh jiwa

SQL*Plus: Release 11.1.0.6.0 - Production on Tue Mar 10 19:54:14 2009

Copyright (c) 1982, 2007, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> select name from v$database;

NAME
---------
JIWA

SQL> select 'happy scripting' from dual;

'HAPPYSCRIPTING
---------------
happy scripting