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#!/bin/bash set -e RULESET=' define set1 = { 2.2.2.0/24, 3.3.3.0/24, } define set2 = { $set1, 1.1.1.0/24 } table ip x { chain y { ip saddr { 3.3.3.0/24, $set2 } } }' $NFT -f - <<< "$RULESET" if [ $? -ne 0 ] ; then echo "E: unable to load ruleset" >&2 exit 1 fi