How to Uninstall Oracle 10g On Linux ?

Before uninstalling, close all oracle processes if there is any

$ORACLE_HOME/bin/shutdown abort
$ORACLE_HOME/bin/emctl stop dbconsole
$ORACLE_HOME/bin/lsnrctl stop
$ORACLE_HOME/bin/isqlplusctl stop

Backup $ORACLE_HOME if necessary (optional)
root> tar -xvf $ORACLE_HOME > /dev/rmt0/bkup

Unintall Steps:

1. run $ORACLE_HOME/bin/localconfig delete
2. rm -rf $ORACLE_BASE/*
3. rm -f /etc/oraInst.loc /etc/oratab
4. rm -rf /etc/oracle
5. rm -f /etc/inittab.cssd
6. rm -f /usr/local/bin/coraenv  /usr/local/bin/dbhome  /usr/local/bin/oraenv

7.remove the oracle user and the related group(dba,oinstall)