Oracle 12cR2 silent installation

Step-1 : download theOracle 12cR2 software files, copied it to Linux server and unziped the files.
Step-2: Create response file under /tmp location with below details 
vi /tmp/12cR2_response_silentinstall.rsp

Note:  Please replace ORACLE_HOSTNAME, ORACLE_HOME and ORACLE_BASE location in the below file

oracle.install.responseFileVersion=/oracle/install/rspfmt_dbinstall_response_schema_v12.2.0
oracle.install.option=INSTALL_DB_SWONLY
ORACLE_HOSTNAME= ip-172-3-16-9
UNIX_GROUP_NAME=oinstall
INVENTORY_LOCATION=/u01/app/oraInventory
SELECTED_LANGUAGES=en
ORACLE_HOME=/u01/app/oracle/product/12.2.0/dbhome_1
ORACLE_BASE=/u01/app/oracle
oracle.install.db.InstallEdition=EE
oracle.install.db.OSDBA_GROUP=dba
oracle.install.db.OSOPER_GROUP=dba
oracle.install.db.OSBACKUPDBA_GROUP=dba
oracle.install.db.OSDGDBA_GROUP=dba
oracle.install.db.OSKMDBA_GROUP=dba
oracle.install.db.OSRACDBA_GROUP=dba
SECURITY_UPDATES_VIA_MYORACLESUPPORT=false
DECLINE_SECURITY_UPDATES=true
oracle.installer.autoupdates.option=SKIP_UPDATES

STEP -3 : Go to 12cR2 installation software location and run the runInstaller in silent mode
cd  <12c software copied location>/database

STEP -4 :  run below script for silent installation.
./runInstaller -ignoreSysPrereqs -showProgress -silent -responseFile /tmp/12cR2_response_silentinstall.rsp