It is expected that Fortran and Ruby interfaces work at a certain level but not as goog as Python interface.
The ruby script
ruby directory reads a VASP
POSCAR formatted file and finds the space-group type. The
option refines a slightly distorted structure within tolerance
spacified with the
-s option. The
-o option gives the symmetry
operations of the input structure.
ruby symPoscar.rb POSCAR -s 0.1 -o -l
Some more options are shown with
ruby symPoscar.rb --help
The way to compile the ruby module is explained in ruby/README.