找到哪个驱动器对应于Linux中的哪个USB大容量存储设备

I have several USB mass storage flash drives connected to a Ubuntu Linux computer (Ubuntu 10.04.1, kernel 2.6.32-25-386), and I need to tell them apart programatically (from bash if possible, but I'm not afraid of compiling either) - I need to find which block device corresponds to which I have several USB mass storage flash drives co