udevinfo 看来最近看的讲udev的材料都提及了一个叫udevinfo的工具
我自己在RHEL7上yum isntall了好久也没找到，google也很少资料，后来在chinaunix上看到有人说类debian的系统早就用udevadm替换udevinfo了
试了下果然有，不甘心，一定要看到红帽的offical说法，于是又去红帽网站搜，终于在红帽6.5的technical notes里面找到了一条：
BZ#947424 The devicemapper plug-in used an obsolete syntax to obtain information from the udev subsystem. The plug-in called the “udevinfo” command instead of the actual command, “udevadm info”. This has been fixed with this update, and the correct property data can now be collected for the relevant block device types.
可以看到从红帽6.5开始已经用udevadm info 替代udevinfo了。完结
