logon monitoriing

I have an oracle STIG that requires that the number of sucessful and unsuccessful logons since the last successful logon be displayed when a user is accessing the database via sql plus.  does anyone have any idea how to do this?  I have logon triggers that populates an audit table, but how do show this interactively?  the logon trigger will only fire during a successful logon.  for successful logins I could query the table, but how to you show the results interactively?

and ideas would be greatly appreciated.

thanks in advance,

Rae