To create a banner so that whenever a user logs into a system will see some default text, you can couple of options
1. put the default text into /etc/motd
2. type echo “<the text you want to display>” into /etc/profile
3. type echo “<the text you want to display>” into user home .profile file.
All the above cases will worf after successful login.
if you want to Display text before successful login
#few others i use to imply