To determine the properties of a primitive, use the l command followed by the primitive name. The example below shows the output of the l command against a [right circular cylinder]:
l cyl1.s
cyl1.s: truncated general cone (TGC)
V (4, 4, -25)
Top (4, 4, 31)
H (0, 0, 56) mag=56
H direction cosines=(90, 90, 0)
H rotation angle=0, fallback angle=90
A (14, 0, 0) mag=14
B (0, 14, 0) mag=14
C (14, 0, 0) mag=14
D (0, 14, 0) mag=14
AxB direction cosines=(90, 90, 0)
AxB rotation angle=90, fallback angle=90
So, the primitive values for the [right circular cylinder] are as follows: