Hey.. so u got more than one camera and need to render all your layers from all your cameras at different frame range… Simple…
render –r mr –s 20 – e 60 – cam ZoomInCam NewScene01.mb
render –r mr –s 80 – e 95 – cam PanCam NewScene01.mb
-s and -e are flag for start frame and end frame respectively.
-cam is the flag for the camera name in the scene here ZoomInCam and PanCam are the names of your camera in your scene [NewScene01.mb ]… which is written at the end… 🙂 hope this helps…