Remove custom iptables chain

remove-iptables-chain.sh

#!bin/bash

table=$1
pattern=$2

if [[ -z "$table" ]] || [[ -z "$pattern" ]]; then
  echo "Usage: $0 <iptables-table-name> <iptables-chain-name-grep-pattern>"
  exit 1
fi

# Remove all references to the chain and all rules from the chain first
iptables -t "$table" -S | grep "$pattern" | grep -- '-A ' | awk '{first = $1; $1=""; print $0}' | sed 's,[][()|;*?$~{}+@%],\\&,g' | tr -d '\' | xargs -t  -d '\n' -I % sh -f -c 'iptables -t '"$table"' -D %'

# Then remove the chain
iptables -t "$table" -S | grep "$pattern" | grep -- '-N ' | awk '{ print $2 }' | xargs -n1 iptables  -t "$table" -X