一个shell监控服务日志的脚本

假设/var/log/a.log是某程序的log文件

他的内容是：

2012-07-27 18:12:17,788 INFO [com.kmsocial.search.websearch.WeiboPool:229] - Weibo pool running!

要求写个脚本，如果超过2分钟没有产生新log则发送邮件给[e-mail]

#!/bin/bash

LOGFILE="/var/log/a.log"
STARTNUM=`wc -l $LOGFILE`
mail_to_root(){
mail -s "weibo pool has some problem" root<<!
there has no logs in two
!
}

exec 6<"$LOGFILE"

while :
do
        NEWNUM=`wc -l $LOGFILE`
        if [ "$STARTNUM"_ = "$NEWNUM"_ ];then
                mail_to_root
        else
                STARTNUM=$NEWNUM
        fi
        while read -u 6 new_log
        do
                if echo "$new_log" | grep -q "Weibo pool running";then
                        while read -u 6 tmp
                        do
                                :
                        done
                        break
                else
                        mail_to_root
                fi
        done
        sleep 120
done
exec 6<&-