grdfft(1gmt) on Linux
The text 40d1eca5a732, as Debian 4.0 (Etch) shipped it.
Perform mathematical operations on grdfiles in the wavenumber (or frequency) domain
Flags it lists
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-A -
-C -
-D -
-E -
-F -
-G -
-I -
-L -
-M -
-N -
-S -
-T -
-V