grdimage(1gmt) on Linux
The text b6f35c8fd7cc, as Debian 8 (Jessie), Debian 5.0 (Lenny), Debian 3.1 (Sarge) shipped it.
Create grayshaded or colored image from a 2-D netCDF grd file
Flags it lists
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-B -
-C -
-E -
-G -
-I -
-J -
-K -
-M -
-P -
-R -
-S -
-T -
-U -
-V -
-X -
-Y -
-bo -
-c