Usage is:

gmk_m2 <dimX> [<dimY> [<output source file>]] <options>

-b<val>

: Set base value for output (0 or 1)

-e

: Build a 8-neighbor grid rather than a 4-neighbor one

-g<file>

: Output the geometry to <file>

-h

: Display this help

-t

: Build a torus rather than a mesh

-V

: Print program version and copyright