Linux welcome messages

Securing the Linux terminal includes telling users that they may not access the system without authorisation.

Edit following files for this purpose;

1. /etc/motd
2. /etc/issue
3. /etc/issue.net

For items 2 and 3, they only work if you are connected at the terminal or have client server setup. Those using SSH, messages can be set to point to item 3 in the configuration file /etc/ssh/sshd_config