segy2grd(1gmt) on Linux
The text 9fb384c149cd, as Debian 4.0 (Etch) shipped it.
Converting SEGY file to grd file format
Flags it lists
-
-A -
-D -
-F -
-G -
-I -
-L -
-M -
-N -
-R -
-S -
-V -
-X -
-Y