[Gmsh] High-order optimization parameters

[FERRERO ANDREA]

Dear All,
I have a problem with the high-order mesh optimizer. In 
particular I cannot set the optimization parameters from 
the command line.
I need to use Gmsh from the command line because I call it 
from a script.
If I use the GUI the algorithm works well and I can 
properly set the parameters (min and max jacobian values 
and number of layers) from the control window, but I 
obtain an error when I try to use the command line option 
described in the documentation.
I'm working with Gmsh 2.8.4 on a 64 bit Linux machine. 
Maybe do I use the wrong syntax?

The following command works but it uses the default 
parameters which are not suitable for my problem:
gmsh -2 -order 2 -optimize_ho geometry.geo

The following command does not work because the last 
option is not recognized:
gmsh -2 -order 2 -optimize_ho -ho_[0.5,2.0,6] geometry.geo

It seems to me that the syntax is correct...what could be 
the problem?

Thanks

Andrea Ferrero