判断网站URL是否正常访问脚本

#!/bin/bash

[ -f /etc/init.d/functions ] && . /etc/init.d/functions

function usage(){
    echo "USAGE:$0 url"
    exit 1
}

RETVAL=0
function CheckUrl(){
    wget -T 10 --spider -t 2 $1 &>/dev/null
    RETVAL=$?
    if [ $RETVAL -eq 0 ];then
        action "$1 url" /bin/true
    else
        action "$1 url" /bin/false
    fi
    return $RETVAL
}

function main(){
    if [ $# -ne 1 ];then
        usage
    fi
    CheckUrl $1
}

main $*