;; While you can use Auto Revert Mode to tail a file, this package
;; contains a third minor mode, Auto Revert Tail Mode, which does so
;; more efficiently, as long as you are sure that the file will only
;; change by growing at the end. It only appends the new output,
;; instead of reverting the entire buffer. It does so even if the
;; buffer contains unsaved changes. (Because they will not be lost.)