Logo Arts

Primitive	Alt	Action
Forward nn Back nn	FD BK	Move turtle forward nn steps. Move turtle back nn steps.
Right nn Left nn	RT LT	Right Turn. Turn turtle right (clockwise) nn degrees. Left Turn. Turn turtle left (counter-clockwise) nn degrees.
PenUp PenDown	PU PD	Raise turtle pen, (no drawing as turtle moves). Lower turtle pen, (draw a line as turtle moves).
HideTurtle ShowTurtle	HT ST	Hide the turtle (make invisible). Show the turtle (make visible).
ClearScreen	CS	Clear the screen, and reset turtle to home position.

Note

1. The command PenDown PenUp doesn't draw a dot. A mechanical turtle would do so but in Logo programs this would create many unwanted dots. To create a dot (in the pen shape and width), use PenDown Forward 0 PenUp. Or Dot Position for a single pixel 'dot'.
2. Be careful using the ClearScreen command in programs. It clears the screen and pen colors to the users personal preferences. This may make your program work differently on another machine. Best to use SetSC and SetPC instead.