grdcontour(1) on Linux
The text bd612a1959f9, as Debian 3.0 (Woody) shipped it. The page shows this text now.
contouring of 2-D gridded data sets
Flags it lists
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-A -
-B -
-C -
-D -
-E -
-G -
-J -
-K -
-L -
-M -
-N -
-O -
-P -
-Q -
-R -
-S -
-T -
-U -
-V -
-W -
-X -
-Y -
-Z -
-bo -
-c