**-h**, **--help**
Print the monitor's options and the available reactors list.
**-r**, **--reactor** *reactor*
Enables the *reactor*. See **-h** for a list of available reactors.
**-s**, **--self**
When tracing (**-t**), also print the events that happened during the **rv**
command itself. If the **rv** command itself generates too many events,
the tool might get busy processing its own events only.
**-t**, **--trace**
Trace monitor's events and error.
**-v**, **--verbose**
Print debug messages.