vim chkweb.sh
#!/bin/bash
#
WEB=("www.hofan.cn" "ums.hofan.cn" "i.hofan.cn" "192.168.51.6")
CHKLOOP=3
LOG=/var/log/chkweb.log

checkrs() {                                  #检测次数
    local I=1
    while [ $I -le $CHKLOOP ]; do
        if curl --connect-timeout 1 http://$1 &> /dev/null;then
          return 0
        fi
        let I++
    done
    return 1
}

while :; do
   for I in ${WEB[*]};do                      # ${WEB[*]} 取所有WEB数组值
     if checkrs $I;then
        echo "`date +‘%F %H:%M:%S‘`,$I is On-line." >> $LOG
     else
        echo "`date +‘%F %H:%M:%S‘`,$I is gone." >> $LOG
     fi
   done