"tail -1" works only with one input file. Using it with multiple input
files throws following error on Ubuntu systems:
tail: option used in invalid context
Adding "-n" makes it work on all cases.
Signed-off-by: Javier Viguera <javier.viguera@digi.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
