grdinfo(1gmt) on Linux
The text 6ab80125fd1e, as Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 3.1 (Sarge) shipped it.
Get information about the contents of a 2-D grd file
Flags it lists
-
-C -
-D -
-F -
-L1 -
-L2 -
-M -
-V