Each time a user logs in to a system, the message of the day in the file /etc/motd is displayed. Use /etc/motd to give users information specific to the system, which someone logging in would want to know. Make sure /etc/motd has read permission to others and write permission to root user only:
1) Login as root or become root user using su
2) Use text editor vi to edit /etc/motd
# vi /etc/motd
3) Edit and save the changes. Next time the user logs in she will be able to see changes.
You should follow me on twitter here or grab rss feed to keep track of new changes.
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