[mapserver-users] shp2img line-command to output mapfile with multiple layers

[nino formica]

I want to use "shp2img" command to create a map image (PNG) from a
mapfile that contains 3 layer.
So I write on terminal (Ubuntu):
shp2img -m my_map.map -o my_map.png -l "layer1" "layer2" "layer3"

But I always get a map with only a layer: the first-one on the list
after "-l" option !
Why ??
How do I get a map image with all the overlapping layers ?

Thanks !
Nino