29.11. Post-Installation Script
You can also add commands to execute on the system after the installation is completed. If the network is properly configured in the kickstart file, the network is enabled, and the script can include commands to access resources on the network. To include a post-installation script, type it in the text area.
Do not include the %post command. It is added for you.
For example, to change the message of the day for the newly installed system, add the following command to the %post section:
echo "Hackers will be punished!" > /etc/motd
More examples can be found in Section 28.7.1, “Examples”.