Question

....... a list of available commands.

Answer 1

here is your answer......dear.....

List of available commands .....
FRAME defines an output frame (a regular grid)
GROUP defines an output group (for regular and curvilinear grids)
CURVE defines an output curve
RAY defines a set of straight output lines (rays)
ISOLINE defines a depth- or bottom contour (for output along that contour)....

hope it helps you...!!