Explain the command to use iptables to block IP in CentOS

ViewLogin on the dayUnsuccessful IP

One command to block all these IPs:

for i in `grep "$(date "%b %d")" /var/log/secure | grep "Failed password" | awk '{print $(NF-3)}' | sort | uniq - c | sort -nr| awk '{print $2}'` ;do iptables -A INPUT -s $i -j DROP; done

Effect:

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