#!/bin/bash#version 1.1#by zengj#using checking urls. /etc/init.d/functions checkurl() {     wget -o /dev/null -T 3 --tries 1 --spider $1 > /dev/null 2>&1       if [ $? -eq 0 ]         then            action "this $1 is true" /bin/true         else            action "this $1 is bad" /bin/false       fi} wait() {     for((i=0;i<3;i++))      do        if [ $i -eq 2 ]         then           echo "."         else           echo -n "."           sleep 2        fi      done}  main(){    array=(http://blog.oldboydu.com           http://blog.etiantian.org           http://oldboy.blog.51cto.com           http://10.0.0.7           http://www.baidu.com)    while(true)    do     echo "------this NO.$((++num)) checkurling------"     for url in ${array[*]}       do         wait         checkurl $url       done         sleep 10      echo " "    done}main