判断ssh登录密码验证错误超过5次的IP被拉黑

[root@crushlinux ~]# cat securehost.sh
#!/bin/bash

awk '/Failed/ {print $(NF-3)}' /var/log/secure | sort |uniq -c | awk '{print $2"="$1}' > /tmp/ip.txt

for i in $(cat /tmp/ip.txt)
do
　　ip=$(echo $i | awk -F= '{print $1}')
　　cishu=$(echo $i | awk -F= '{print $2}')

　　if [ $cishu -ge 5 ]
　　then
　　　　echo "sshd:$ip" >> /etc/hosts.deny
　　else
　　　　echo "$ip $cishu次登录异常" >> /tmp/ssh-error.txt
　　fi
done