Shell to prevent brute force cracking

In order to prevent the server from being subjected to SSH brute force hack, will attempt ssh brute force hack this machine more than 10 times of IP to seal off, prohibit its landing this machine!

#!/bin/bash

Cat/var/log/secure |awk '/failed/{print $ (NF-10)} ' | Sort |uniq-c| | awk ' {print $ ' = ' $ $; ' >/home/test.list

For i in ' cat/home/test.list '

Do

Ip= ' echo $i |awk-f "=" ' {print '} '

N= ' echo $i |awk-f "=" ' {print $} '

If [${n}-GT 10]; Then

A= ' grep $IP/etc/hosts.deny '

If [-Z $a]; then

echo "sshd: $IP:d eny" >>/etc/hosts.deny

Fi

Fi

Done

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Shell to prevent brute force cracking