After login you can have the contents of a “banner” file displayed on the user’s screen.

* Open up the sshd configuration file:

sudo gedit /etc/ssh/sshd_config

* Find:

#Banner /etc/issue.net

* Replace:

Banner /etc/issue.net

* Edit the issue.net file to contain what you want displayed:

sudo gedit /etc/issue.net

* Add what you want:

_
___ _ _ ___ _____ ___| |___
| -_|_’_| .’| | . | | -_|
|___|_,_|__,|_|_|_| _|_|___|
|_|
Welcome to my server

* Restart SSHD:

sudo /etc/init.d/ssh restart