Ive been working on some command line stuff with an external developer through team viewer for work, to interact with th CL i use terminal on OSX, when working with the developer i was always watching what they were doing and i also have all the bash history.

Usually upon opening terminal i get something like this

Last login: Tue Sep 17 21:33:02 on ttys001
You have mail.
unknown-5c:00:00:00:00:00:~ sam$

(note ive replaced some characters in the last line with 00)

But today when i opened up terminal and i get this

Last login: Mon Oct 21 16:49:35 on ttys000
You have mail.
richies-ipad:~ sam$ 

Note it now says richies-ipad - any idea why this is ? I dont know any one called richie let alone let them have access to my machine. Is this something to be worried about - the fact that someone has enough access to change that ?

Also what does the ttys001 part on the first line mean ?