/usr/bin/unflatten: option -- unrecognized
Usage: /usr/bin/unflatten [-f?] [-l <M>] [-c <N>] [-o <outfile>] <files>
  -o <outfile> - put output in <outfile>
  -f           - adjust immediate fanout chains
  -l <M>       - stagger length of leaf edges between [1,<M>]
  -c <N>       - put disconnected nodes in chains of length <N>
  -?           - print usage