Anon tester

#!/bin/bash

IP=127.0.0.1
URL=PUT_A_URL_FOR_CHECKING

for i in `cat ips.txt`; do
        RET=`curl -m 5 -s -x ${i} ${URL}`

        if [ $? -eq 0 ]; then
                GOOD=`echo $RET | grep -c ${IP}`;
                if [ $GOOD -eq 0 ]; then
                        echo ${i};
                fi
        fi
done