> $ wg-quick save wg0 > Option "-brief" is unknown, try "ip -help". The `-brief`-option seems to be available since iproute2-150831 (kernel 4.2.0). CentOS 7 uses iproute2-130716 (kernel 3.10). wireguard seems to officially support kernel >= 3.10, so it should probably not use the `-brief`-option. Regards, Nino