Run this script using su instead of sudo. The ">" redirects of echo will not work otherwise.
intel_iommu=on (or) amd_iommu=on\ rd.driver.pre=vfio-pci\ kvm.ignore_msrs=1
MODULES="vfio_pci vfio vfio_iommu_type1 vfio_virqfd"\ FILES="/usr/bin/vfio-pci-override.sh"\ Hooks="... vfio ...."