Existem dois comandos possivelmente relevantes detalhados no manual fino para less(1)
R Repaint the screen, discarding any buffered input. Useful if
the file is changing while it is being viewed.
F Scroll forward, and keep trying to read when the end of file is
reached. Normally this command would be used when already at
the end of the file. It is a way to monitor the tail of a file
which is growing while it is being viewed. (The behavior is
similar to the "tail -f" command.)