#!/bin/bash PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin export PATH # define url WEB_URL=("http://www.example.com" "http://www1.example.com" "http://www2.example.com") # check network NET_ALIVE=$(ping -c 5 8.8.8.8 |grep 'received'|awk 'BEGIN {FS=","} {print $2}'|awk '{print $1}') if [ $NET_ALIVE == 0 ]; then     echo "Network is not active,please check your network configuration!"     exit 0 fi # check url for((i=0; i!=${#WEB_URL[@]}; ++i)) {   ALIVE=$(curl -o /dev/null -s -m 10 -connect-timeout 10 -w %{http_code} ${WEB_URL[i]} |grep"000000")   if [ "$ALIVE" == "000000" ]; then     echo "'${WEB_URL[i]}' can not be open,please check!" | mail -s "Website Notification to ${WEB_URL[i]}" yourname@example.com     echo "failed"   else     echo "'${WEB_URL[i]}' is OK!"   fi }