HCP's wb_command -surface-geodesic-distance

I’m trying to compute geodesic distances between vertices of a surface file using HCP workbench’s command wb_command -surface-geodesic-distance. One part of the related official documentation is as follows (full doc here), but I’m still confused about what to put in the position of <vertex> and <metric-out> ? should I specify the index of vertex for <vertex>? (which will be an integer)?

COMPUTE GEODESIC DISTANCE FROM ONE VERTEX TO THE ENTIRE SURFACE
wb_command -surface-geodesic-distance
- the surface to compute on
- the vertex to compute geodesic distance from
- output - the output metric

  [-naive] - use only neighbors, don't crawl triangles (not recommended)

  [-limit] - stop at a certain distance
     <limit-mm> - distance in mm to stop at