EdgeCam postprocessor for Haas or Linuxcnc 4 axis needet. XYZ + A

Hello, guys

I am learning how to program cnc machine with 4 axes. I built a cnc machine to train. I can already mill with 3 axes. My machine is controlled by a computer with a linux cnc system. At work I use Edgecam. I have to learn to work on 4 axes quickly. I need a postprocessor for Edgecam for machines with Linuxcnc or Haas control. Linux "understands" the codes generated for Haas, so it makes no difference. It must be a 4 axis postprocessor. XYZ + A. The topic is quite urgent, so please help me.