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"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>