grd2cpt(1gmt) on Linux
The text 30902df7eb92, as Debian 8 (Jessie) shipped it.
Make a color palette table from grid files
Flags it lists
-
-C -
-D -
-E -
-I -
-L -
-M -
-N -
-Q -
-R -
-S -
-T -
-V -
-Z