How to install oracle9i on Linux(RHEL AS 3)

Here I show a simplified steps for installation oracle9i in Linux (Red Hat Enterprise Linux Advanced Server 3)
–set system environment
su – root
echo `expr 512 \* 1024 \* 1024` > /proc/sys/kernel/shmmax
groupadd dba
useradd -c “Oracle software owner” -g dba oracle
passwd oracle
oracle (input twice)
mkdir -p /opt/oracle/product/9.2.0
chown -R oracle.dba /opt/oracle
mkdir -p /var/opt/oracle
chown oracle.dba /var/opt/oracle
chmod 755 /var/opt/oracle
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