[darrenf]

You can have vim constantly refresh a buffer if it's modified externally, like this turns your buffer into a kinda-sorta-version of `tail -f`:

    :set autoread | au CursorHold * checktime | call feedkeys("G")

So if it's already a file, just open it with vim; if it's a STDOUT/STDERR stream, redirect/`tee` to a file and open that.