How to switch between multiple files in UNIX while using VI editor?
For Linux Red-Hat VI version 7.2.411 use :n and :N to switch next and previous.
Next file: :n
Previous file: :p
, :N
or :prev
depending on which vi implementation you're using.
Here's a typical cheat sheet which has a section "Files" on this topic.
http://www.lagmonster.org/docs/vi2.html