No default on mesos-ls --help

[ssk2]

usage: mesos-ls [-h] [-v] [-q] task [path]

List all the files inside a specific task's sandbox

positional arguments:
  task           ID of the task. May match multiple tasks (or all)
  path           Path to view. (default: )

optional arguments:
  -h, --help     show this help message and exit
  -v, --version  show program's version number and exit
  -q             Suppresses printing of headers when multiple tasks are being
                 examined (default: False)

No default for path.