定义函数的方式，监控网站的存活状态

#!/bin/bash
. /etc/init.d/functions
RETVAL=0
SCRIPTS_PATH="/tmp/test"
MAIL_GROUP="shengwei.tang@joy4you.com"
LOG_FILE=/tmp/test/web.log
function GetUrlStatus(){
        FAILCOUNT=0
        for i in `seq 3`;do
                wget -T 2 --tries=1 --spider http://${1} >/dev/null 2>&1
                [ $? -ne 0 ] && let FAILCOUNT+=1;
        done
        if [ $FAILCOUNT -gt 1 ];then
                RETVAL=1
                NOWTIME=$(date "+%Y-%m-%d %H:%M:%S")
                echo "http://${1} service is error,${NOWTIME}" > $LOG_FILE
                for MAIL_USER in $MAIL_GROUP;do
                        /usr/local/bin/sendEmail -f shengwei.tang@joy4you.com -t 1011464647@qq.com -s smtp.exmail.qq.com -u "${MAIL_USER}"  -xu shengwei.tang@joy4you.com -xp 123456 -m $(cat ${LOG_FILE}) >& /dev/null
                done
        else
                RETVAL=0
        fi
        return $RETVAL
}
[ ! -d "$SCRIPTS_PATH" ] && mkdir $SCRIPTS_PATH
[ ! -f "$SCRIPTS_PATH/domain.list" ] &&{
cat > $SCRIPTS_PATH/domain.list <<EOF
www.baidu.com
EOF
}
for URL in `cat $SCRIPTS_PATH/domain.list`;do
        echo -n "checking $URL"
        GetUrlStatus $URL && action " successful" /bin/true || action  "failure" /bin/false
done