wtr.watcher PATH=. [-UNIT TIME]
wtr.watcher -h, --help
wtr.watcher -v, --version

  PATH
    Any path. Relative or absolute.
    Defaults to the current directory.
    If the given path doesn't exist,
    the current directory is used.

  UNIT
    One of:
    -nanoseconds,  -ns,
    -microseconds, -us,
    -milliseconds, -ms,
    -seconds,      -s,
    -minutes,      -m,
    -hours,        -h,
    -days,         -d,
    -weeks,        -w,
    -months,       -mts,
    -years,        -y

  TIME
    Any positive integer, as long as it's
    less than ULONG_MAX. Which is large.

  -h, --help
    Show this help message and exit.

  -v, --version
    Show version information and exit.