Most companies will have their own standard-usage policy. Log into most Unix, Linux or Windows servers these days and you’ll see some message regarding who can be authorised to access the system, and so on.
Some of those messages can run into pages depending on what company has written them, but they can equally be constrained by the options available in the individual system.
NetWorker Management Console does allow for a brief (80 character) message to be set as the login banner. Normally this is a simple warning indicating that only authorised users can log in. But it can be set relatively easily. For instance, on my lab server it reads:
Setting the greeting message is very straight forward. In NetWorker Management Console, go to Setup and from within Setup, choose the Setup|System Options… menu item:
The login banner message is set in the very first field:
While brief at 80 characters (no carriage return symbols can be input), the ability to set the login banner can help meet security requirements in some companies, so don’t forget it’s there.