Greetings,

I'm new to scripting and need a little help. I have a NAS server and want to make a script that bans IP if they fail login several times.

The problem is that I dont know how to compare the IP's in the file. If they exist more than 3 times do ....

#!/bin/sh
set -x

X=4
rm /home/banip/output
touch /home/banip/output.1

grep "Invalid user root" /var/log/messages|cut -c 68-79 > /home/banip/output.1

#If the same entry is gathered in the file more than x times

A=`cat /home/banip/ban_this_ip|wc -l`
echo $A
if [ "$A" -ge "$X" ]
then
cat $ theIP >> /etc/config/ipsec_deny.conf
else

echo "Nothing to worry about"

fi

#########################################
#Output.1 now contains:

218.22.9.118
218.22.9.118
218.22.9.118

So if the above scenario where the same IP exists more 3 times (is unique) then insert this ip into /etc/config/ipsec_deny.conf