grdfft(1) on Linux
The text fd7664427640, as Debian 3.0 (Woody) shipped it. The page shows this text now.
Perform mathematical operations on grdfiles in the frequency domain
Flags it lists
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-A -
-C -
-D -
-E -
-F -
-G -
-I -
-L -
-M -
-S -
-T -
-V