Changing the welcome message in SSH
If your a linux user or maybe a simple linux server administrator with some servers at hand, the chances are that you use SSH to login there and manage them.
When a user logs in to SSH usually he sees a welcome message.
If you have an ubuntu machine like me then you will see the following message
The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.
To access official Ubuntu documentation, please visit:
http://help.ubuntu.com/
In order to change this message just type in the terminal

Update:
Note: On restart your changes to /etc/motd will be reverted, the reason is that /etc/motd is a symbolic link to /var/run/motd which is rebuilt by /etc/init.d/bootmisc.sh from a template, /etc/motd.tail, at each reboot. (thank you Adam Trickett).
lrwxrwxrwx 1 root root 13 2008-11-27 14:18 motd -> /var/run/motd
jo@jo-desktop:/etc$
This means that to make your changes permanent you can either:
1. change
then reboot
2. point the /etc/motd symlink to a different file such as /etc/motd.static and make your changes there. (Also thank you Adam Trickett).
Joe