检测RRDtool的数据是否有异常，如流量比较平稳，但由于一些意外原因，造成rrdtool生成的图片有波动。或者也可用于预警，把此脚本定时每*分钟执行一次，每此它都会检索指定目录下的rrd文件是否有异常数据。如果有就自动发邮件报警。-RRDtool data to detect whether there are exceptions, such as the flow rate is relatively stable, but due to some unexpected reasons, resulting rrdtool generated images fluctuate. Or it can be used for early warning, the timing of this scr ipt executed once per minute*, it will retrieve this if every rrd files in the specified directory abnormal data. If there is an alarm automatically send e-mail.