grdlandmask(1gmt) on Linux
The text 032a4892901a, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
Create "wet-dry" mask grdfile from shoreline data base.
Flags it lists
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-A -
-D -
-F -
-G -
-I -
-N -
-R -
-V