gdal_contour(1) on Linux
The text fd26493da9b2, as Debian 6.0 (Squeeze) shipped it.
.TH "gdal_contour" 1 "Sun Sep 5 2010" "GDAL"
Flags it lists
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-a -
-b -
-f -
-fl -
-i -
-nln -
-off -
-snodata