check_proxy.sh

#!/bin/bash
if [ -z $1 ]
then
    echo "Usage: $0 path/2/proxy.list"
    exit 1
fi

cat "$1" | while read line
do
    host=`echo $line | sed 's/:[0-9]*.//'`
    if [ ! -z `ping -c1 -W0 $host > /dev/null && echo 'alive'` ]
    then
        echo $line >> work_proxy.list
    fi

done
exit 0