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December 19, 2015 17:09
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idempotent iptables command
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| REJECT_RULE_NO=$(iptables -L INPUT --line-numbers | grep 'REJECT' | awk '{print $1}'); if ! (iptables-save | grep -q -- "-A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT"); then iptables -I INPUT $REJECT_RULE_NO -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT; fi |
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