Get IP for specified host using 'http://ping.eu/ping', then write it to hosts.

get_ip.sh

#!/bin/bash

# Get IP for specified host using 'http://ping.eu/ping', then write it to hosts.

if [ $# -ne 1 ]; then
    echo "Usage: $0 host"
    echo "  e.g. # $0 baidu.com"
    exit 0
fi

host=$1
ip=$(curl -s -d "host=$host&go=Go" http://ping.eu/action.php?atype=1 | grep "bytes from" | head -n 1 | grep -E -o "([0-9]{1,3}\.){3}[0-9]{1,3}")


if [ "$ip" != "" ]; then
    echo "Writing \"$ip $host\" to /etc/hosts"
    echo "$ip $host" >> /etc/hosts
else
    echo "Failed to get IP for host \"$host\". Please check it on http://ping.eu/ping/"
fi