The second line is maya saying its selected those faces. which, if that's all the faces on the sphere, you don't need to worry about; I think all unwraps by default affect the whole object if you don't otherwise specify the faces.
as for the third line, you really only to input the following;
polyProjection -type Spherical polySurface383.f[0:n]
(where n is your last face)
although that assumes the default values for things are what you want (for an explanation of the flags in the command, look in the MEL command reference in the help menu).
Not 100% sure how to get it to count the faces like you need, though.