greenspline(1gmt) on Linux
The text 29895d01002f, as Debian 8 (Jessie) shipped it.
Interpolate 1-D, 2-D, 3-D Cartesian or spherical surface data using Green's function splines.
Flags it lists
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-A -
-C -
-D -
-F -
-G -
-H -
-I -
-L -
-N -
-Q -
-R -
-S -
-T -
-V -
-bi -
-bo -
-f