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If you have already installed Oracle VirtualBox and the Linux operating system, you can proceed with the Install Oracle 19c software part. If you do not have a virtual Box to Install Oracle 19c software, follow the article How to Install and setup Oracle Virtual Box.

Please proceed with the below steps to install Oracle 19c software in your machine/server/VirtualBox:

1. Login to your machine/server/VirtualBox (Here machine1) as root and open terminal. Check ifconfig and note down the IP address.

IP - 192.168.56.11 (Received from 1st step)
username - root
Password - root123

If you do not know how to log in/set up PUTTY/MobaXterm, please follow the articles Putty install/setup MobaXterm Install/setup.

[root@machine1 ~]# groupadd oinstall
[root@machine1 ~]# groupadd dba

[root@machine1 ~]# grep oinstall /etc/group
oinstall:x:1001:
[root@machine1 ~]# grep dba /etc/group
dba:x:1002:

[root@machine1 ~]# useradd -g oinstall -G dba oracle
[root@machine1 ~]# grep oracle /etc/passwd
oracle:x:1001:1001::/home/oracle:/bin/bash

[root@machine1 ~]# passwd oracle
Changing password for user Oracle.
New password:
BAD PASSWORD: The password contains the user name in some form
Retype new password:
passwd: all authentication tokens updated successfully.

[root@machine1 ~]# mkdir -p /u01/app/oracle                                #ORACLE_BASE
[root@machine1 ~]# mkdir -p /u01/app/oracle/product/19.3.0/dbhome_1        #ORACLE_HOME
[root@machine1 ~]# mkdir -p /u01/app/oraInventory                          #Central Inventory

[root@machine1 ~]# chown -R oracle:oinstall /u01/app/oracle
[root@machine1 ~]# chown -R oracle:oinstall /u01/app/oraInventory
[root@machine1 ~]# chmod -R 775 /u01/app/oracle
[root@machine1 ~]# chmod -R 775 /u01/app/oraInventory

f. Use the below “oracle-database-preinstall-19c” package to perform all your prerequisite setup by issuing the following command:

yum install -y oracle-database-preinstall-19c

cat /etc/sysctl.d/99-oracle-database-preinstall-19c-sysctl.conf

cat /etc/security/limits.d/oracle-database-preinstall-19c.conf

4. Open Mobaxterm and log in as an Oracle user:

IP - 192.168.56.11
username - oracle
password - oracle123

5. Unzip the Oracle home Software as an Oracle user and run the runInstaller to install Oracle software:

unzip /softwares/19.3.0.0.0/LINUX.X64_193000_db_home.zip -d /u01/app/oracle/product/19.3.0/dbhome_1

cd /u01/app/oracle/product/19.3.0/dbhome_1
./runInstaller

NOW FOLLOW THE BELOW INSTRUCTIONS GIVEN IN EACH SCREENSHOT:

6. Click on Set up software only to install the Oracle software and click on Next:

7. Click on single instance database installation and click next:

8. Select Enterprise Edition and click on Next:

9. Crosscheck the Oracle base and oracle home location and click on next:

10. Crosscheck the oracle inventory and click on next:

11. Choose OSOPER group to dba and click on next:

12. Use the root password and click on Next:

13. Wait until prerequisite checks are done :

14. Now you have two options:(Choose any one)

a.Save the response file and cancel the installer to start the installer in silent mode using the created response file:

I have saved the response file in the /home/oracle location with the name db.rsp. Now run the below command to start the installer in silent mode.

$ORACLE_HOME/runInstaller -silent -responseFile /home/oracle/db.rsp

b.Click on Install to proceed:

15. Ignore the warning and click on yes:

16. Congratulations! You have successfully installed oracle software on your machine. Click on close.

17. Verify if the Oracle 19c client was installed successfully:

a. verify if SQL*Plus is running from Oracle home:
which sqlplus

b.Check the inventory details:
cat /u01/app/oraInventory/ContentsXML/inventory.xml

If you need detailed information about Oracle 19c client, follow the referenced article Install Oracle 19c Software/Client.