#!/bin/bash set -e RULESET="add table x add set x y { type ipv4_addr; flags interval;} add element x y { 1.1.1.0/24 } delete element x y { 1.1.1.0/24 }" $NFT -f - <<< "$RULESET" if [ $? -ne 0 ] ; then echo "E: unable to load good ruleset" >&2 exit 1 fi