/usr/bin/nbd-trplay: invalid option -- '-' /usr/bin/nbd-trplay -i -l [-m ] [-b -l [-m ] [-b elements from file to disk image . Command line parameters: : name of the initial image file. : nbd trace log. Must contain actual data (datalog=true). : device block size. Default 512. : where to stop the replay. Default all. -v: Increase verbose level. Specify multiple times to increase further.