Message prompts on when somebody logins using ssh /etc/motd

edit /etc/motd

Whatever you write in this file, displays when somebody, logins using ssh in your system.

e.g

[root@localhost ~]# ssh 192.168.4.13
root@192.168.4.13's password:
Last login: Wed Feb 18 17:44:44 2009 from 192.168.4.141
*****************************************
* *
* Vikas Sharma *
* *
*****************************************

[root@vikas ~]#