I am trying to find out how I can display what port I am on when telneted into my 4509
I understand what you mean. Normally that should be planned out and patched back to the switch with some descriptive notations.
If you don't know what port you are on then ya, you have to figure it out by seeing what MAC is on what switchport. Hope this has helped and please rate if so. If you have any other questions just reply back.