Use
tail -f -n +1
Usar man tail
fornecerá mais detalhes, o trecho relevante a seguir.
<snip>Numbers having a leading plus ('+') sign are relative to the
beginning of the input, for example, ''-n +2'' starts the display at the
second line of the input.</snip>
-f The -f option causes tail to not stop when end of file is
reached, but rather to wait for additional data to be appended to
the input. The -f option is ignored if the standard input is a
pipe, but not if it is a FIFO.
-n number
The location is number lines.