dimfilter(1gmt) on Linux
The text 4b8dc09c8314, as Debian 7 (Wheezy) shipped it.
Directional filtering of 2-D gridded files in the space (or time) domain
Flags it lists
-
-D -
-F -
-G -
-I -
-N -
-Q -
-R -
-T -
-V