improve portability; make script work using bash
improve portability; make script work using bash

RedDog99/bielefeld,RedDog99/bielefeld,meskal/ffff-next,meskal/ffff-next,ffff-next/ffff-next,meskal/ffff-next,RedDog99/bielefeld,ffff-next/ffff-next,ffff-next/ffff-next,ffff-next/ffff-next